Cant spin tires - The 1947 - Present Chevrolet & GMC Truck Message Board Network

orange72350 · 10-27-2003, 12:54 AM

i have a 72 gmc, longbox, it has a rebuilt 350, tweeked a little, and a turbo 350 tranny., we figure the engine is good for about 340 horse. the rearend is a 12 bolt, posi. even from a dead stop, i cant spin tires. i tried brakestanding, and same. they dont spin. the tires are fairly tall, im not 100% sure, but i think 305/75/15. i think those are the numbers. im not sure bout the ratio in the rear. Any ideas what i can do to make it easier to roast rubber. i sorta wanna be able to cook some rubber when i hear these import guys talking down the old muscle. I know the easiest way to roast rubber is more torque, but that requires money. anyhelp is greatly appreciated.
thanx
dale

Longhorn Man · 10-27-2003, 01:01 AM

Get new gears for the rear..you should have 3.07 if originally a small block/automatic.
Get smaller tires.
Get more torque.

orange72350 · 10-27-2003, 01:05 AM

I like the new rear gears idea. i dont regularly drive the highway, mostly running around town/racing. i was thinking 4.11's. How big of a job is the swap? or would i be better to go with a whole new rearend/diskbrakes? if i go the way of just new gears, what is a guy looking at for price? and can i do it myslef? i have access to a shop chock full of all the best tools. thanx
dale

Longhorn Man · 10-27-2003, 01:16 AM

best bet, and cheapest rout is to find a whole rear axle in a junk yard, or under a member's truck who wants to cruise the freeway.
To chainge the gear set, you're looking at some real work. Your carrier isn't set up for that kind of gear, and the gear its self would blow the budget and a years worth of gas money.

cableguy0 · 10-27-2003, 01:18 AM

need more specs on the motor what are the exact cam specs not just that its an rv cam what kinda heads are on it and i will dyno the motor with an accurate prog not desktop dyno. the program was developed with the help of keith black it is about dead accurate. also do you have a stall verter. and is your combo able to work properly together

1969 GMC · 10-27-2003, 01:28 AM

swap in a 4 speed with low first. i'm pretty sure you can make a 250 smoke 'em with the SM465's granny low.

:p

bigjimzlll · 10-27-2003, 09:26 AM

To be making 340HP you must have a pretty stout cam..big heads..headers..the C/R has to be around 10-1. Stock HP is around 200 or so.....to gain an extra 140hp takes a lot of money. Steeper gear....cheaper yet..shorter tire..stall converter or the ever popular N20..give me your engine info..Ill run a DD200 on it

lukecp · 10-27-2003, 09:51 AM

When i had a 350 with an RV cam, edelbrock intake, headers, it wouldn't spin tires from a dead stop at all. If i were to powerbrake the truck it would, but if it was just sitting still and i floored it it wouldn't spin at all. Now that i have some 64cc heads on it, it will spin the tires for about 15 feet from a dead stop...personally i wouldn't worry about it. Hooking up is a good thing...you don't want your power to go up in smoke

bigjimzlll · 10-27-2003, 10:12 AM

for an example..my engine is around 500HP..with a 4500 stall and 3.73 gears, I can put it in 3rd gear(manual valve body) and smoke steet tires for 602'. The tires were(lol) 275-60x15. When I had 280HP with a 2500 stall, I could power brake them..but would only spin for around 10' in first gear

tommie · 10-27-2003, 10:39 AM

can someone desktop dyno (or whatever) my engine for me?

what all specs are needed?

thanks
tommie

gldevall · 10-27-2003, 10:59 AM

This is about 300 horses at the crank with 3.73's with 255/60/15's. http://67-72chevytrucks.com/vboard/s...threadid=74493

lukecp · 10-27-2003, 01:03 PM

For DD2000, you need:

Engine Block, and overbore
Cylinder heads (casting # if you know it)
Intake and Exhaust valve sizes
Compression Ratio
Carb CFM
Intake Manifold type (dual plane, single plane, ect.)
Exhaust system
Cam manufactuer and part #

cableguy0 · 10-27-2003, 03:28 PM

i just dynoed that motor with a small cam .405 and .427 lift with 195 and .205 dur@.050 and its making 254 hp@4000rpm and 373lb ft @2000rpm thats with 8.5-1 comp stock heads dual plane intake headers with mufflers 1.94 1.50 valves. seriously doubt that motor is making 340 horsepower especially with stock heads. an rv cam doesnt exist anymore that was a generic spec used in the 70's and into the 80's rv cam tells me nothing except that its small. at the most with a bigger cam that motor might be making 275 horsepower. its not easy to get 350 horsepower everyone thinks they have a 350 horse 350 but they dont it aint that easy

Fred T · 10-27-2003, 03:46 PM

My tires are 235/70R15, 28" diameter. Have 3.07 gears, TH400 with stock converter, 350 with unknown cam, dynomax headers, tuned HEI, Performer intake, 600 cfm Holley and the heads are from a high compression 327, makes a very torky engine.
I can spin the wheels on dry, clean pavement. Not only from a dead stop, but also from a rolling start at 15 mph. Not a real burnout, but it will turn em over.

71MoneyPit · 10-27-2003, 04:24 PM

One word... Torque

My truck has 295/50/15 Toyo's out back with a Locker,3.08 gears, 500ci Cadillac and stock Caddy th400.

If you hit the pedal from a stop it will roast the tires clear through 3rd. theres really no reason to brakestand it. If you hit the pedal at any speed 30mph or below it will spin them also(thats when the 4bbls kick in) gotta love them 750cfm carbs

CPNEJR · 10-27-2003, 04:39 PM

I was wondering after reading this thread if my truck (once finished) could smoke the tires.

I have a stock 350 rebuilt no to long ago with a 650 cfm edlebrock carb 3 speed tranny with 3:08 gears in 67 short step with 50's in rear and 60's in front?

**CPNE** · 10-27-2003, 04:43 PM

Quote:

Originally posted by CPNEJR
I was wondering after reading this thread if my truck (once finished) could smoke the tires.

Uhmmmmmm...no

CPNEJR · 10-27-2003, 04:51 PM

Quote:

originally posted by CPNE
uhmmmmmm...no

uhmmmmmm... aren't you supposed to be working and I'm starting homework at 4:00

bigjimzlll · 10-27-2003, 08:00 PM

ooops...busted..lol

CPNEJR · 10-27-2003, 08:08 PM

Which one of us? If you mean my dad ya but can't blame him when you could sleep for an hour and still get caught up in 10 min since it was so slow I had heard.

I'd do the same thing:p

c-tenkid · 10-27-2003, 08:26 PM

I have a 69 lwb.My old motor was a 350 with a .458 lift,218 duration at .050,Edelbrock performer RPM,1406 carb.hedman 1 5/8 headers into 2.5 inch dual exhaust,HEI with accel super coil.I have 3:73 limited slip.(it didn't work for reason in 1st gear)I had a 3 speed manual.

I could spin the tires (or should I say tire) from a stand still for probably 80 feet until I shifted to second and then it would spin them some more.And bark the tires into 3rd gear at 55mph.

Can anyone desktop dyno the combo I used to have.I am thinking it had about 300hp/330 foot pounds.The heads where casting # 462624.

Thanks.

dropped_71chevy · 10-27-2003, 08:43 PM

I could spin anytime I felt like it with a basically stock 350 and it would chirp em going into second. Its an automatic by the way. i have no idea what rearend. It's more than likely a 307 rearend. I don't understand how you couldn't.

**uncle** · 10-27-2003, 08:50 PM

I have a small block 400 with comp cams 270k kit,30 over,stock turbo 350,373 posi,30 inch tires(285/70-15) and trans. is junk. When I first put the engine it would barely spin tires. I'll suggest one thing that helped me and that was a 10 degree vacuum advance. It still won't smokem, but it will leave 2 pretty nice marks. P.S., you can unplug your vacuum advance and see how that works before going out to buy a new one.

lukecp · 10-27-2003, 09:12 PM

C-tenkid:
HP: 285@ 4500rpm
TQ: 366@ 3500rpm

leadfoot067 · 10-27-2003, 09:43 PM

ok i have a 67swb,350 2bbl,350t,3.08 posi....from a dead stop it will leave about 50 feet of rubber...carb and ignition tuning has alot to do with how the engine reacts from a dead stop...tuning does wonders......and 255/60/15 tires...

10-27-2003, 12:54 AM	#1
orange72350 Registered User Join Date: Jan 2003 Location: Cold, Snowy High Level, Alberta Canada Eh Posts: 394	Cant spin tires i have a 72 gmc, longbox, it has a rebuilt 350, tweeked a little, and a turbo 350 tranny., we figure the engine is good for about 340 horse. the rearend is a 12 bolt, posi. even from a dead stop, i cant spin tires. i tried brakestanding, and same. they dont spin. the tires are fairly tall, im not 100% sure, but i think 305/75/15. i think those are the numbers. im not sure bout the ratio in the rear. Any ideas what i can do to make it easier to roast rubber. i sorta wanna be able to cook some rubber when i hear these import guys talking down the old muscle. I know the easiest way to roast rubber is more torque, but that requires money. anyhelp is greatly appreciated. thanx dale __________________ 2003 yamaha raptor. Stock, but it still hauls!!!! 2000 skiddo mxz 700. Camoplast 1.5 inch track, jaws twin pipes, b+b can, custom built and weighted clutch, wiseco piston, high comp heads. its very fast. wow. 72 c-10 longbox. Bright Orange. Brand new 350, rv cam, performer intake, qjet, headers, 2 1/2 inch exhaust into hooker areo chamber mufflers. Body work coming soon. "dont let yer mind wander, its to little to go places by itself." "Forget the herse, cause i'll never die"-ACDC Back In Black "If It's To Loud, Yer Just Too Old" "I Love Anything Fast Enough To Do Something Stupid In" "Instant idiot, just add beer!!""

10-27-2003, 01:05 AM	#3
orange72350 Registered User Join Date: Jan 2003 Location: Cold, Snowy High Level, Alberta Canada Eh Posts: 394	I like the new rear gears idea. i dont regularly drive the highway, mostly running around town/racing. i was thinking 4.11's. How big of a job is the swap? or would i be better to go with a whole new rearend/diskbrakes? if i go the way of just new gears, what is a guy looking at for price? and can i do it myslef? i have access to a shop chock full of all the best tools. thanx dale __________________ 2003 yamaha raptor. Stock, but it still hauls!!!! 2000 skiddo mxz 700. Camoplast 1.5 inch track, jaws twin pipes, b+b can, custom built and weighted clutch, wiseco piston, high comp heads. its very fast. wow. 72 c-10 longbox. Bright Orange. Brand new 350, rv cam, performer intake, qjet, headers, 2 1/2 inch exhaust into hooker areo chamber mufflers. Body work coming soon. "dont let yer mind wander, its to little to go places by itself." "Forget the herse, cause i'll never die"-ACDC Back In Black "If It's To Loud, Yer Just Too Old" "I Love Anything Fast Enough To Do Something Stupid In" "Instant idiot, just add beer!!""

10-27-2003, 01:18 AM	#5
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	need more specs on the motor what are the exact cam specs not just that its an rv cam what kinda heads are on it and i will dyno the motor with an accurate prog not desktop dyno. the program was developed with the help of keith black it is about dead accurate. also do you have a stall verter. and is your combo able to work properly together __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

10-27-2003, 01:28 AM	#6
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	swap in a 4 speed with low first. i'm pretty sure you can make a 250 smoke 'em with the SM465's granny low. :p __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

10-27-2003, 09:26 AM	#7
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	To be making 340HP you must have a pretty stout cam..big heads..headers..the C/R has to be around 10-1. Stock HP is around 200 or so.....to gain an extra 140hp takes a lot of money. Steeper gear....cheaper yet..shorter tire..stall converter or the ever popular N20..give me your engine info..Ill run a DD200 on it __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

10-27-2003, 01:01 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Get new gears for the rear..you should have 3.07 if originally a small block/automatic. Get smaller tires. Get more torque.

10-27-2003, 01:16 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	best bet, and cheapest rout is to find a whole rear axle in a junk yard, or under a member's truck who wants to cruise the freeway. To chainge the gear set, you're looking at some real work. Your carrier isn't set up for that kind of gear, and the gear its self would blow the budget and a years worth of gas money.

10-27-2003, 09:51 AM	#8
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	When i had a 350 with an RV cam, edelbrock intake, headers, it wouldn't spin tires from a dead stop at all. If i were to powerbrake the truck it would, but if it was just sitting still and i floored it it wouldn't spin at all. Now that i have some 64cc heads on it, it will spin the tires for about 15 feet from a dead stop...personally i wouldn't worry about it. Hooking up is a good thing...you don't want your power to go up in smoke __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

10-27-2003, 10:12 AM	#9
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	for an example..my engine is around 500HP..with a 4500 stall and 3.73 gears, I can put it in 3rd gear(manual valve body) and smoke steet tires for 602'. The tires were(lol) 275-60x15. When I had 280HP with a 2500 stall, I could power brake them..but would only spin for around 10' in first gear __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

10-27-2003, 10:39 AM	#10
tommie 97' Tahoe 2dr/2wd Join Date: Jul 2002 Location: Huffman,TX Posts: 1,168	can someone desktop dyno (or whatever) my engine for me? what all specs are needed? thanks tommie

10-27-2003, 10:59 AM	#11
gldevall Registered User Join Date: Mar 2003 Location: Walker, LA Posts: 2,925	This is about 300 horses at the crank with 3.73's with 255/60/15's. http://67-72chevytrucks.com/vboard/s...threadid=74493 __________________ Gary -1986 SWB: lowered 4/6, SOLD!!! -Best 1/4 mile: 14.51 @ 91.01 MPH -2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!! -2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels

10-27-2003, 01:03 PM	#12
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	For DD2000, you need: Engine Block, and overbore Cylinder heads (casting # if you know it) Intake and Exhaust valve sizes Compression Ratio Carb CFM Intake Manifold type (dual plane, single plane, ect.) Exhaust system Cam manufactuer and part # __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

10-27-2003, 03:28 PM	#13
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	i just dynoed that motor with a small cam .405 and .427 lift with 195 and .205 dur@.050 and its making 254 hp@4000rpm and 373lb ft @2000rpm thats with 8.5-1 comp stock heads dual plane intake headers with mufflers 1.94 1.50 valves. seriously doubt that motor is making 340 horsepower especially with stock heads. an rv cam doesnt exist anymore that was a generic spec used in the 70's and into the 80's rv cam tells me nothing except that its small. at the most with a bigger cam that motor might be making 275 horsepower. its not easy to get 350 horsepower everyone thinks they have a 350 horse 350 but they dont it aint that easy __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

10-27-2003, 03:46 PM	#14
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	My tires are 235/70R15, 28" diameter. Have 3.07 gears, TH400 with stock converter, 350 with unknown cam, dynomax headers, tuned HEI, Performer intake, 600 cfm Holley and the heads are from a high compression 327, makes a very torky engine. I can spin the wheels on dry, clean pavement. Not only from a dead stop, but also from a rolling start at 15 mph. Not a real burnout, but it will turn em over. __________________ Fred There is no such thing as too much cam...just not enough engine.

10-27-2003, 04:24 PM	#15
71MoneyPit MPG...hmm..more like GPM Join Date: Sep 2002 Location: Medford, Oregon Posts: 339	One word... Torque My truck has 295/50/15 Toyo's out back with a Locker,3.08 gears, 500ci Cadillac and stock Caddy th400. If you hit the pedal from a stop it will roast the tires clear through 3rd. theres really no reason to brakestand it. If you hit the pedal at any speed 30mph or below it will spin them also(thats when the 4bbls kick in) gotta love them 750cfm carbs __________________ (Looking for 67-72 shortwide or shortstep bed) 71 C-10, 500ci of tire shredding Caddy torque, th400, 12 bolt w/Powertrax Lock-Right. Bald Rear Tires 85 Toyota 4x4- 22r 4-banger, 5 speed, I can actually AFFORD to drive this one.



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10-27-2003, 04:39 PM	#16
CPNEJR Registered User Join Date: Sep 2003 Location: Franconia,N.H. Posts: 1,029	I was wondering after reading this thread if my truck (once finished) could smoke the tires. I have a stock 350 rebuilt no to long ago with a 650 cfm edlebrock carb 3 speed tranny with 3:08 gears in 67 short step with 50's in rear and 60's in front? __________________ (Only) Member of the CPNE Fan Club Aint that the truth 67 C-10 350 with 3-speed tranny and 308 gears swb step 82 Z28 Camaro 355 small block over 350 hp and a borg warner super t-10 (blown engine) 72 Chevy K20 Suburban (future project) 70 Chevy K20 now 68 GMC K2500 2003 Chevy 2500hd ccsb 4X4 (daily driver)

10-27-2003, 08:00 PM	#19
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	ooops...busted..lol __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

10-27-2003, 08:08 PM	#20
CPNEJR Registered User Join Date: Sep 2003 Location: Franconia,N.H. Posts: 1,029	Which one of us? If you mean my dad ya but can't blame him when you could sleep for an hour and still get caught up in 10 min since it was so slow I had heard. I'd do the same thing:p __________________ (Only) Member of the CPNE Fan Club Aint that the truth 67 C-10 350 with 3-speed tranny and 308 gears swb step 82 Z28 Camaro 355 small block over 350 hp and a borg warner super t-10 (blown engine) 72 Chevy K20 Suburban (future project) 70 Chevy K20 now 68 GMC K2500 2003 Chevy 2500hd ccsb 4X4 (daily driver) Last edited by CPNEJR; 10-27-2003 at 09:43 PM.

10-27-2003, 08:26 PM	#21
c-tenkid Registered User Join Date: Apr 2003 Location: Festus mo Posts: 370	I have a 69 lwb.My old motor was a 350 with a .458 lift,218 duration at .050,Edelbrock performer RPM,1406 carb.hedman 1 5/8 headers into 2.5 inch dual exhaust,HEI with accel super coil.I have 3:73 limited slip.(it didn't work for reason in 1st gear)I had a 3 speed manual. I could spin the tires (or should I say tire) from a stand still for probably 80 feet until I shifted to second and then it would spin them some more.And bark the tires into 3rd gear at 55mph. Can anyone desktop dyno the combo I used to have.I am thinking it had about 300hp/330 foot pounds.The heads where casting # 462624. Thanks. __________________ 69 c-10 lwb,Converted to 4x4,dana 44f,12blt,4 inch lift,vortec headed 355,th350/np203 34x10.50x15 swamper tsl's

10-27-2003, 08:43 PM	#22
dropped_71chevy Registered User Join Date: Sep 2002 Location: Northern Colorado Posts: 198	I could spin anytime I felt like it with a basically stock 350 and it would chirp em going into second. Its an automatic by the way. i have no idea what rearend. It's more than likely a 307 rearend. I don't understand how you couldn't.

10-27-2003, 08:50 PM	#23
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,288	smokin I have a small block 400 with comp cams 270k kit,30 over,stock turbo 350,373 posi,30 inch tires(285/70-15) and trans. is junk. When I first put the engine it would barely spin tires. I'll suggest one thing that helped me and that was a 10 degree vacuum advance. It still won't smokem, but it will leave 2 pretty nice marks. P.S., you can unplug your vacuum advance and see how that works before going out to buy a new one.

10-27-2003, 09:12 PM	#24
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	C-tenkid: HP: 285@ 4500rpm TQ: 366@ 3500rpm __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg Last edited by lukecp; 10-27-2003 at 09:16 PM.

10-27-2003, 09:43 PM	#25
leadfoot067 horsepower junkie Join Date: Aug 2003 Location: graham, washington Posts: 326	ok i have a 67swb,350 2bbl,350t,3.08 posi....from a dead stop it will leave about 50 feet of rubber...carb and ignition tuning has alot to do with how the engine reacts from a dead stop...tuning does wonders......and 255/60/15 tires... __________________ 67 short wide box,350/700r4/3.73posi 71 olds cutlass "S" mom bought new..12.30s@113MPH

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