Tuning question! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HvyChevy454 · 06-05-2002, 09:42 PM

after many numerous attempts to try to tune my engine on my own I now turn to yall for help. Ive got the edelbrock 1410 atop a performer RPM intake. its an 850 cfm so i know its plenty for the motor. i know i have the timing right too. but the problem is when i get on the gas the truck will climb through the rpms smoothly until it gets into the high 3000's and up, itll start to loose power,idle back, cough, and just make a whole lotta heck till it shifts and drop the rpm. it only does it when i am gettin on the gas b/c it will only do it if the throttle is more than half way. Is it running too rich too lean are teh secondaries not doing their job? I dont know, im lost?

*Randy70C-10* · 06-05-2002, 09:54 PM

Sounds like your vacuum advance isn't working.

HvyChevy454 · 06-05-2002, 10:04 PM

just spent $150 on a new mallory distributor.

Longhorn Man · 06-05-2002, 10:16 PM

My eldebrock did this when the secondarys were not getting any fuel.

mikep · 06-05-2002, 10:17 PM

How much total timing are you running?

HvyChevy454 · 06-05-2002, 10:19 PM

engine is advanced 12 degree i left the stock springs in the new distrib.

Super Chevy · 06-05-2002, 10:32 PM

TTT for hvy-chevy

mikep · 06-05-2002, 11:40 PM

Ok. Heres a few questions that will help diagnose things.

Whats your total timing at 3200 rpm?

Wheres your vacuum advance plugged into ?

Is it manifold or venturi vacuum to your vacuum advance? Are you using vacuum advance?

You put the stock springs in the new distributor? What type of distributor are you using now? What did you use before?

Ae you sure the throttle plates are opening all the way. Have you checked with someone else working the gas pedal?

Is this a new motor? New timing cover? Balancer?

Do you know your at idle vacuum reading?

Do you use a PCV system?

Wheres your fuel filter? is it new? What about the pump? do you have a pressure gauge? Can you get a pressure/vacuum gauge... you know the $20 handheld type?

Scrub · 06-06-2002, 12:22 AM

I have the Edlebroke manual choke model. It is about like yours. I am told that the jets are not usually right. There was extensive disscussion on Wes' board about it and the conclusion was that most Edlebrokes will need to be run through the calibration kit to get them right. I guess the kit has a selection of jets and stuff. I never bothered.

I am not real happy with the Edlebroke. Give a Holley any day (Another Ford vs Chevy type argument)

Good luck

*Zkast* · 06-06-2002, 12:41 AM

T- into your fuel line between the pump and carb, Find a way to run a line so you can watch the gauge. Give it a good hard run and note the readings while its acting up.

If pressure and timing are ok, look at exhaust backpressure. Any mods done lately? crushed pipe? Does it sound like it always has?

If all of these are ok I would start looking into the carb... restricted fuel inlet, float drop setting incorrect or stuck secondary butterfly.

You mentioned a new distributor, was the problem before or after that?

Just a recap... 3 main things that will cause it: Lack of fuel, too much backpressure (restricted exhaust) or loss of ignition.

HvyChevy454 · 06-06-2002, 09:16 AM

- dont know the timing at 3200
- vac advance it plugged n2 the port below the throttle plates
its carb manifold to the vacuum advance
- i left i the stock timing curve springs in the new mallory distrib i bought
- i had a stock 1986 HEI distrib off of a 350
- plates open that was a prob b4, it only acts up under a load, cant simulate it in the garage
- motor has 16k on it new cam, timing chain, cover and balancer have been remover and replaced
- if i recall the vacuum was like 21'' my dad thought it was alot of vacuum
- new pcv also
- new fuel filter and new purolator electric fuel pump
- dual 3'' exhuast h-pipe 40 series Flowmaster for almost a year
- problem was b4 the new distrib, its the reason i bought a new distrib

Sheenanny · 06-06-2002, 12:47 PM

Did you install the new cam after the motor was built? did you change valves, springs? Sounds to me like you could be "floating the valves" at these high rpm. This means the springs aren't strong enough to close the valves at high rpm.

mikep · 06-06-2002, 01:23 PM

Its sounds to me like you have a couple of problems.

1. Put the mallory springs back in the distributor. You want the advance to come on quicker for best performance and late model HEI springs arent the way to go. Also buy or borrow and advance timing light and set your timing up to 34-38 degrees at 3200 rpm or so. That might make your initial timing more than 12 degrees but that doesnt matter.Initial timing means nothing.

2. That fuel pump probably isnt delivering enugh fuel to keep your engine fed and your running out of gas. If its the little purolator crappy one I am thinking of it definitely isnt enough especially if thats a big block you are trying to feed. That popping and other symptoms is your carb going way lean from lack of fuel. Barring something off the wall I'm 99% positive thats your base problem. Edelbrock( carter) carbs dont have large fuel bowls and they need a good 5 psi of fuel pressure under load to work at all with higher performance than stock motors . The stock mechanical chevy fuel pump can handle it. I run a carter high perf mechanical and it more than feeds mine but I have experienced similar problems feeding carter type carbs with undersized electric pumps .

Also check the fuel strainer in the gas tank if it has one to make sure it isnt clogged.

HvyChevy454 · 06-06-2002, 03:57 PM

had to get me started on the cam ordeal...

i put a comp cams timing chain and 268H-10 cam w/.495 lift and new lifters according to comp cams this is supposed to be the biggest cam i could put in the engine and still retain my stock rockers springs and pushrods. well it wasnt b/c when i put the cam in the stock pushrods were now too short. i could not adjust the rockers b/c the motor has non adjustable rockers. so i had to spend more money on new set of rockers that were adjustable. Had i know that in the 1st place i would of went and got a whole kit for a bigger cam. a $180 cam/lifter set ended up turning into a $500 ordeal

anyway, driving home from work today i noticed it will only do if i start from a dead or near dead stop and power all the way through. it will not do it if im cruising then drop it into the passing gear. if from a dead stop i spin the tires the whole time it will not do it. if i let off to let the tires get grip then continue on hard it does act up.

tom hand · 06-06-2002, 04:35 PM

OK I am going to take a stab at this one. According to edelbrocks website, the 1410 is a 750 marine sqaurebore carb. You said you have it mounted on a performer intake which is a speadbore. To do that you are supposed to use edelbrocks adapter #2732. It is just a flat metal plate that keeps that carb from having a vacuum leak on that intake. For some reason most people never hear about the little plate. [The only reason I know about it is I worked in speedshop for a while] Here's the link.

http://www.edelbrock.com/automotive/index.html

vfrdude · 06-06-2002, 04:44 PM

'well it wasnt b/c when i put the cam in the stock pushrods were now too short. i could not adjust the rockers b/c the motor has non adjustable rockers.'

We are talking about a Chevy small block 350 aren't we???
As far as I know ALL Chevrolet motors have adjustable rocker arms, the stock pushrods/rockers should have worked just fine...

By ALL, I mean later model (68 and up) motors, I'm sure there are some older versions that may have had non adjustable rocker arms...

HvyChevy454 · 06-06-2002, 05:08 PM

91 454 big block

HvyChevy454 · 06-06-2002, 05:11 PM

my mistake i have the 1407 just the tuning specs were on the same page in my little book, but i do have the adapter plate on it.

Professor · 06-06-2002, 05:16 PM

Did the truck originally have a 6-cyl in it? Are you using the original fuel tank and sending unit? Weren't the 6-cyl tank fuel pickup tubes smaller than the V-8 ones? That could restrict your fuel flow.

HvyChevy454 · 06-06-2002, 05:18 PM

it had a v8 in it but i have the poly blazer tank in it now

HvyChevy454 · 06-06-2002, 06:31 PM

ok at 3200 rpm i have 55 degrees of advance. that seems like alot

mikep · 06-06-2002, 07:19 PM

WAY too much advance. why dont you try disconnecting the vacuum advance and plugging the port and see if that helps. You dont want more than 40 degrees under just about any circumstance.

You do need more fuel pump than that though. try the advance first but that little diaphragm electric pump is a piece of ****. It wont feed your 454. Mallory makes a real nice QUIET gerotor electric pump for about $150. Holleys are too loud and having gone through too many before there was any option besides holley I dont think they are very good pumps. They'll drive you nuts.

vfrdude · 06-07-2002, 10:37 AM

Boy, do I feel silly... I should read the signatures more... big blocks don't have adjustable rocker arms? I've never worked on a big block, I just assumed they were similar to the small blocks..

It does sound like it's a timing issue though... 55 degrees is way too much timing...

mikep · 06-07-2002, 10:59 AM

late model big blocks dont have adjustable rockers. Earlier models do.

HvyChevy454 · 06-08-2002, 02:37 PM

well the fuel pump solved it! runs awesome now, i just wish i could get it to lauch better, it feels like the engine struggles off idle, people tell me its me 3.08 rear end but i was hoping the BB would have the torque to make up fro it

06-05-2002, 09:42 PM	#1
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	Tuning question! after many numerous attempts to try to tune my engine on my own I now turn to yall for help. Ive got the edelbrock 1410 atop a performer RPM intake. its an 850 cfm so i know its plenty for the motor. i know i have the timing right too. but the problem is when i get on the gas the truck will climb through the rpms smoothly until it gets into the high 3000's and up, itll start to loose power,idle back, cough, and just make a whole lotta heck till it shifts and drop the rpm. it only does it when i am gettin on the gas b/c it will only do it if the throttle is more than half way. Is it running too rich too lean are teh secondaries not doing their job? I dont know, im lost? __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

06-05-2002, 10:04 PM	#3
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	just spent $150 on a new mallory distributor. __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

06-05-2002, 10:17 PM	#5
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	How much total timing are you running? __________________ No truck :-(

06-05-2002, 10:19 PM	#6
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	engine is advanced 12 degree i left the stock springs in the new distrib. __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

06-05-2002, 11:40 PM	#8
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Ok. Heres a few questions that will help diagnose things. Whats your total timing at 3200 rpm? Wheres your vacuum advance plugged into ? Is it manifold or venturi vacuum to your vacuum advance? Are you using vacuum advance? You put the stock springs in the new distributor? What type of distributor are you using now? What did you use before? Ae you sure the throttle plates are opening all the way. Have you checked with someone else working the gas pedal? Is this a new motor? New timing cover? Balancer? Do you know your at idle vacuum reading? Do you use a PCV system? Wheres your fuel filter? is it new? What about the pump? do you have a pressure gauge? Can you get a pressure/vacuum gauge... you know the $20 handheld type? __________________ No truck :-( Last edited by mikep; 06-06-2002 at 12:07 AM.

06-05-2002, 09:54 PM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Sounds like your vacuum advance isn't working.

06-05-2002, 10:16 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	My eldebrock did this when the secondarys were not getting any fuel.

06-05-2002, 10:32 PM	#7
Super Chevy Registered User Join Date: Feb 2001 Location: Ohio Posts: 1,025	TTT for hvy-chevy

06-06-2002, 12:22 AM	#9
Scrub Collector of rusty Items Join Date: Dec 2001 Location: Sisters,Oregon USA Posts: 731	I have the Edlebroke manual choke model. It is about like yours. I am told that the jets are not usually right. There was extensive disscussion on Wes' board about it and the conclusion was that most Edlebrokes will need to be run through the calibration kit to get them right. I guess the kit has a selection of jets and stuff. I never bothered. I am not real happy with the Edlebroke. Give a Holley any day (Another Ford vs Chevy type argument) Good luck __________________ Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

06-06-2002, 12:41 AM	#10
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	T- into your fuel line between the pump and carb, Find a way to run a line so you can watch the gauge. Give it a good hard run and note the readings while its acting up. If pressure and timing are ok, look at exhaust backpressure. Any mods done lately? crushed pipe? Does it sound like it always has? If all of these are ok I would start looking into the carb... restricted fuel inlet, float drop setting incorrect or stuck secondary butterfly. You mentioned a new distributor, was the problem before or after that? Just a recap... 3 main things that will cause it: Lack of fuel, too much backpressure (restricted exhaust) or loss of ignition.

06-06-2002, 09:16 AM	#11
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	- dont know the timing at 3200 - vac advance it plugged n2 the port below the throttle plates its carb manifold to the vacuum advance - i left i the stock timing curve springs in the new mallory distrib i bought - i had a stock 1986 HEI distrib off of a 350 - plates open that was a prob b4, it only acts up under a load, cant simulate it in the garage - motor has 16k on it new cam, timing chain, cover and balancer have been remover and replaced - if i recall the vacuum was like 21'' my dad thought it was alot of vacuum - new pcv also - new fuel filter and new purolator electric fuel pump - dual 3'' exhuast h-pipe 40 series Flowmaster for almost a year - problem was b4 the new distrib, its the reason i bought a new distrib __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

06-06-2002, 12:47 PM	#12
Sheenanny Registered User Join Date: May 2002 Location: Lexington, KY Posts: 23	Did you install the new cam after the motor was built? did you change valves, springs? Sounds to me like you could be "floating the valves" at these high rpm. This means the springs aren't strong enough to close the valves at high rpm.

06-06-2002, 01:23 PM	#13
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Its sounds to me like you have a couple of problems. 1. Put the mallory springs back in the distributor. You want the advance to come on quicker for best performance and late model HEI springs arent the way to go. Also buy or borrow and advance timing light and set your timing up to 34-38 degrees at 3200 rpm or so. That might make your initial timing more than 12 degrees but that doesnt matter.Initial timing means nothing. 2. That fuel pump probably isnt delivering enugh fuel to keep your engine fed and your running out of gas. If its the little purolator crappy one I am thinking of it definitely isnt enough especially if thats a big block you are trying to feed. That popping and other symptoms is your carb going way lean from lack of fuel. Barring something off the wall I'm 99% positive thats your base problem. Edelbrock( carter) carbs dont have large fuel bowls and they need a good 5 psi of fuel pressure under load to work at all with higher performance than stock motors . The stock mechanical chevy fuel pump can handle it. I run a carter high perf mechanical and it more than feeds mine but I have experienced similar problems feeding carter type carbs with undersized electric pumps . Also check the fuel strainer in the gas tank if it has one to make sure it isnt clogged. __________________ No truck :-( Last edited by mikep; 06-06-2002 at 01:29 PM.

06-06-2002, 03:57 PM	#14
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	had to get me started on the cam ordeal... i put a comp cams timing chain and 268H-10 cam w/.495 lift and new lifters according to comp cams this is supposed to be the biggest cam i could put in the engine and still retain my stock rockers springs and pushrods. well it wasnt b/c when i put the cam in the stock pushrods were now too short. i could not adjust the rockers b/c the motor has non adjustable rockers. so i had to spend more money on new set of rockers that were adjustable. Had i know that in the 1st place i would of went and got a whole kit for a bigger cam. a $180 cam/lifter set ended up turning into a $500 ordeal anyway, driving home from work today i noticed it will only do if i start from a dead or near dead stop and power all the way through. it will not do it if im cruising then drop it into the passing gear. if from a dead stop i spin the tires the whole time it will not do it. if i let off to let the tires get grip then continue on hard it does act up. __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

06-06-2002, 04:35 PM	#15
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	OK I am going to take a stab at this one. According to edelbrocks website, the 1410 is a 750 marine sqaurebore carb. You said you have it mounted on a performer intake which is a speadbore. To do that you are supposed to use edelbrocks adapter #2732. It is just a flat metal plate that keeps that carb from having a vacuum leak on that intake. For some reason most people never hear about the little plate. [The only reason I know about it is I worked in speedshop for a while] Here's the link. http://www.edelbrock.com/automotive/index.html __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS



Register or Log In To remove these advertisements.

06-06-2002, 04:44 PM	#16
vfrdude Registered User Join Date: May 2002 Location: Oakley, Ca. USA Posts: 137	'well it wasnt b/c when i put the cam in the stock pushrods were now too short. i could not adjust the rockers b/c the motor has non adjustable rockers.' We are talking about a Chevy small block 350 aren't we??? As far as I know ALL Chevrolet motors have adjustable rocker arms, the stock pushrods/rockers should have worked just fine... By ALL, I mean later model (68 and up) motors, I'm sure there are some older versions that may have had non adjustable rocker arms... __________________ Rudy Fierros '95 Honda VFR750F Used to have a '71 Chevy Stepside, Guards Red, Lowered 4" rear, 3" front, White Oak bed wood, 700R4 w/373 gears until some low life stole it!

06-06-2002, 05:08 PM	#17
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	91 454 big block __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

06-06-2002, 05:11 PM	#18
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	my mistake i have the 1407 just the tuning specs were on the same page in my little book, but i do have the adapter plate on it. __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

06-06-2002, 05:16 PM	#19
Professor Registered User Join Date: Mar 2001 Location: Fayetteville, Arkansas Posts: 160	Did the truck originally have a 6-cyl in it? Are you using the original fuel tank and sending unit? Weren't the 6-cyl tank fuel pickup tubes smaller than the V-8 ones? That could restrict your fuel flow.

06-06-2002, 05:18 PM	#20
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	it had a v8 in it but i have the poly blazer tank in it now __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

06-06-2002, 06:31 PM	#21
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	ok at 3200 rpm i have 55 degrees of advance. that seems like alot __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti Last edited by HvyChevy454; 06-06-2002 at 06:34 PM.

06-06-2002, 07:19 PM	#22
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	WAY too much advance. why dont you try disconnecting the vacuum advance and plugging the port and see if that helps. You dont want more than 40 degrees under just about any circumstance. You do need more fuel pump than that though. try the advance first but that little diaphragm electric pump is a piece of ***. It wont feed your 454. Mallory makes a real nice QUIET gerotor electric pump for about $150. Holleys are too loud and having gone through too many before there was any option besides holley I dont think they are very good pumps. They'll drive you nuts. __________________ No truck :-( Last edited by mikep; 06-06-2002 at 08:08 PM.*

06-07-2002, 10:37 AM	#23
vfrdude Registered User Join Date: May 2002 Location: Oakley, Ca. USA Posts: 137	Boy, do I feel silly... I should read the signatures more... big blocks don't have adjustable rocker arms? I've never worked on a big block, I just assumed they were similar to the small blocks.. It does sound like it's a timing issue though... 55 degrees is way too much timing... __________________ Rudy Fierros '95 Honda VFR750F Used to have a '71 Chevy Stepside, Guards Red, Lowered 4" rear, 3" front, White Oak bed wood, 700R4 w/373 gears until some low life stole it!

06-07-2002, 10:59 AM	#24
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	late model big blocks dont have adjustable rockers. Earlier models do. __________________ No truck :-(

06-08-2002, 02:37 PM	#25
HvyChevy454 Slowly getting CRSS... Join Date: Jul 2001 Location: Lutz, Florida Posts: 656	well the fuel pump solved it! runs awesome now, i just wish i could get it to lauch better, it feels like the engine struggles off idle, people tell me its me 3.08 rear end but i was hoping the BB would have the torque to make up fro it __________________ -Nic Lutz, Fl My Team Website The Heavy Chevy Website ------------------ 72 Cheyenne 10 LWB GM 12-bolt 3.08 w/ Auburn Posi 91 454 Edel Performer RPM Intake 750 cfm carb Comp Cam 268/.495 Hedman Headers Dual 3'' Exhaust 71 Cheyenne 20 4x4 Fact. A/C PS PB Tilt Currently in the works... Speak Softly and Carry A Big Block... There is No replacement for Displacement... "If everything seems under control, you're just not going fast enough." - Mario Andretti

Register or Log In To remove these advertisements.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode