When does your truck red line? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Iceman7642 · 07-25-2005, 02:04 AM

When i floor it it shifts from second to thrid at about 4000-4100 rpm, and i have never had it higher then that.

it just seems like a low rpm for a red line (well what i consider red line)

what can your guys' engine do?

**pjmoreland** · 07-25-2005, 02:11 AM

You can get an adjustable vacuum modulator for your transmission which will allow you to adjust the shift point.

Werewolf · 07-25-2005, 04:52 AM

Depends. 4100 isn't very steep for a stock engine designed for torque over horsepower. I had an old 350 of some sort in my '79 Monte Carlo. Early 70's engine, I found out it came out of a *bus.* 300+ on torque, but only 165hp. I could tow a truck with that car, but the engine wouldn't make any power beyond 4000 RPM at all.

Longhorn Man · 07-25-2005, 05:07 AM

Actually, the vacume modulator isn't going to do anything in this instance. When you floor it, vacume drops to near 0 and the shifting is controlled by the kick down cable and the gonenor weights.

Is your kickdown cable hooked up to the carb?

**special-K** · 07-25-2005, 07:30 AM

So,where`s the redline on a stock 350?

**pjmoreland** · 07-25-2005, 09:09 AM

Oops, sorry.

Fred T · 07-25-2005, 09:34 AM

A bone stock 350 is usually limited by the ignition. HEI module usually drops out by 5,000 rpm. That's also around where the valve springs start to "float", they don't have the ability to reseat the valves between strokes fast enough. You also run into airflow problems with the heads around 5,000 rpm. If you fix these areas the bottom end is usually good for around 6,000 rpm.

Sillyoldman · 07-25-2005, 10:12 AM

Seldome. Used to do it when my wife was'nt with me.

Iceman7642 · 07-25-2005, 11:00 AM

the kick down is hooked up and works, I have HEI. the engine was out to a late 60's muscle car, rebuilt put in a sprint car, rebiult again and put in the truck, then i bought the truck put on performer intake and edelbrock 650 (i think, maybe 550) carb... so i really dont know what is inside the engine, but is a c-20 and it was a custom camper truck, till i got a hold of it...

67ChevyRedneck · 07-25-2005, 11:13 AM

If I slam and floor my 67 it will shift around 4500 RPM, but my 00 Z71 will go all the way to about 5000 if I floor it before it shifts.

72vortec350 · 07-25-2005, 04:52 PM

I usually shift mine manually at around 5500, but i have a small cam, performer rpm intake, and vortec heads.

speedracer · 07-25-2005, 09:17 PM

check out my user title that's all I have to say!

Lobo'74 · 07-26-2005, 07:10 PM

350 Chevy V8, 4-bolt mains, with the following mods:
Machining work done by Terry Walters precision engines, Roanoke, VA.
Bored .030 over = 355 cubic inch
Align bored
Parallel top of block
New cam bearings
New freeze plugs
New hypereutectic pistons, flat top
Reconditioned connecting rods
Crankshaft main and rod journals ground .010 under
Rotating assembly balanced
Double roller timing chain
Melling high volume, high pressure oil pump (Melling M55-HV oil pump?)
Speed Pro cam: Intake 224 deg dur, .450â€ lift; Exhaust 224 deg dur, .460â€ lift
New hydraulic lifters and push rods
World Industries part #012250-1 Sportsman II cylinder heads with 72cc chambers (9.5 to 1 compression), stainless steel valves 2.02 intake, 1.6 exhaust, heavy-duty valve springs, screw-in studs, guide plates

Crane part #11744-16 roller rocker arms (Rollers on both fulcrum and tip)
EdelbrockÂ* # 1470 750 CFM 4-barrel carburetor
Edelbrock performer RPM aluminum intake manifold
HEI distributor (Late-70â€™s style)
Dyna-max Headers
Â*
Note: For correct tune-up parts, such as spark plugs, cap, rotor, coil, plug wires, use parts made for a 1979 Chevy C10 pickup 350 Cu in. engine. This also applies to accessories such as the alternator, water pump, thermostat, radiator, clutch disk, pressure plate, throwout bearing, and transmission. The power steering pump and gearbox are from a 1985 Chevy truck.

Previous Owner rebuilt it and set it up. He said with the work done on it and the balanced rotating parts it has a 6500 red line. I've had it there maybe twice. I use 6000 as the red line and usually shift at 5500 or so. It pulls very strong all the way to 6500. I just don't want to over rev it and have the engine eat itself.

*rage'nrat638* · 07-26-2005, 07:38 PM

Got It Set At 7200 Rpm......

FirstGen · 07-27-2005, 12:00 AM

Dyno flattened at 6800 but I shift at 6500 ish. Hard on the syncros much higher than that...

68w/sbc406 · 07-27-2005, 12:38 AM

mine sees 5500 atleast once every time i drive it

71Dragtruck · 07-27-2005, 12:58 AM

BBC shifting at 6800, rev limiter set at 7200, but I do have a couple of aftermarket parts.

68C15 · 07-27-2005, 08:14 AM

406 I built in a 77 Impala back in HS. redline unknown, I hit just over 8K MANY times. add in the 2.28:1 gears & all the open interstate one could ask for. I guess I was trying to duplicate Allinson's Talledega scenario (dumba$$ me). I just cant figure out why the TH350 trannys kept spitting parts. huh?!

but your problem sounds like you need to tune the trans governor.

bowtie · 07-27-2005, 11:00 AM

396 shifts @ 6200 rpms.

Robert1970C20rstbukt · 07-27-2005, 07:13 PM

Mine redlines after 70.

XXL · 07-27-2005, 08:35 PM

Red line? What's that?

/250 & 1-bbl
//calc shows 2539 RPM at 55mph... need a tach to verify

68haywagon · 07-27-2005, 09:36 PM

Quote:

Originally Posted by XXL

Red line? What's that?

/250 & 1-bbl
//calc shows 2539 RPM at 55mph... need a tach to verify

Sounds about right. When I'm doing 65 in mine I'm just under 3k. Anyone know what the redline is on a 250 L6?

Mike

68C15 · 07-27-2005, 11:08 PM

Quote:

Originally Posted by 68haywagon

Anyone know what the redline is on a 250 L6?

Mike

with the factory intake & one-lunger i would say about 4K. try for 7K & see what happens.

speedracer · 07-28-2005, 01:36 PM

Quote:

Originally Posted by 68C15

with the factory intake & one-lunger i would say about 4K. try for 7K & see what happens.

I had a 75 nova with a 250 L6 in neutral if you floor it it would hold 4800 like it had a rev limiter I was tring to blow it up before droping a 305 in it. I drove it around the block a few times in first gear pedal on the floor and all it did was get me funny looks from the neighbors.

68w/sbc406 · 07-30-2005, 03:59 AM

Quote:

Originally Posted by 68haywagon

Anyone know what the redline is on a 250 L6?

Mike

when mine still had the 250 i shifted it at 42-4500 all day. hey it would scratch 4th

07-25-2005, 07:30 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	So,where`s the redline on a stock 350? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

07-25-2005, 09:34 AM	#7
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	A bone stock 350 is usually limited by the ignition. HEI module usually drops out by 5,000 rpm. That's also around where the valve springs start to "float", they don't have the ability to reseat the valves between strokes fast enough. You also run into airflow problems with the heads around 5,000 rpm. If you fix these areas the bottom end is usually good for around 6,000 rpm. __________________ Fred There is no such thing as too much cam...just not enough engine.

07-25-2005, 10:12 AM	#8
Sillyoldman #16876 Join Date: Apr 2005 Location: Auburn WA Posts: 12,266	Seldome. Used to do it when my wife was'nt with me. __________________ Posted via Stationary Device '71 Custom Deluxe C-20 402. '67 Buick Special 455. '49 Plymouth Special Deluxe. *"I love that old car smell"* *Some people are like Slinkies... not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.*

07-25-2005, 11:00 AM	#9
Iceman7642 P!$$ on Ford Join Date: Jun 2003 Location: Federal Way, WA Posts: 334	the kick down is hooked up and works, I have HEI. the engine was out to a late 60's muscle car, rebuilt put in a sprint car, rebiult again and put in the truck, then i bought the truck put on performer intake and edelbrock 650 (i think, maybe 550) carb... so i really dont know what is inside the engine, but is a c-20 and it was a custom camper truck, till i got a hold of it... __________________ [FONT="Impact"][COLOR="Navy"]Michael Lowered 1972 C-20 Longbed with 350 and TH350 1995 Tahoe LS - Custom intake, k&n, TBI spacer, sweet tail lights, clear front lights... 2009 Nissan Versa I am 26, married, and we had our first baby in July of 2009

07-25-2005, 11:13 AM	#10
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	If I slam and floor my 67 it will shift around 4500 RPM, but my 00 Z71 will go all the way to about 5000 if I floor it before it shifts. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

07-25-2005, 02:04 AM	#1
Iceman7642 P!$$ on Ford Join Date: Jun 2003 Location: Federal Way, WA Posts: 334	When does your truck red line? When i floor it it shifts from second to thrid at about 4000-4100 rpm, and i have never had it higher then that. it just seems like a low rpm for a red line (well what i consider red line) what can your guys' engine do? __________________ [FONT="Impact"][COLOR="Navy"]Michael Lowered 1972 C-20 Longbed with 350 and TH350 1995 Tahoe LS - Custom intake, k&n, TBI spacer, sweet tail lights, clear front lights... 2009 Nissan Versa I am 26, married, and we had our first baby in July of 2009

07-25-2005, 02:11 AM	#2
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,426	You can get an adjustable vacuum modulator for your transmission which will allow you to adjust the shift point.

07-25-2005, 04:52 AM	#3
Werewolf Woof? Join Date: Jun 2005 Location: Raleigh, NC Posts: 276	Depends. 4100 isn't very steep for a stock engine designed for torque over horsepower. I had an old 350 of some sort in my '79 Monte Carlo. Early 70's engine, I found out it came out of a bus. 300+ on torque, but only 165hp. I could tow a truck with that car, but the engine wouldn't make any power beyond 4000 RPM at all.

07-25-2005, 05:07 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Actually, the vacume modulator isn't going to do anything in this instance. When you floor it, vacume drops to near 0 and the shifting is controlled by the kick down cable and the gonenor weights. Is your kickdown cable hooked up to the carb?

07-25-2005, 09:09 AM	#6
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,426	Oops, sorry.

07-25-2005, 04:52 PM	#11
72vortec350 Registered User Join Date: Jul 2005 Location: va Posts: 2	I usually shift mine manually at around 5500, but i have a small cam, performer rpm intake, and vortec heads.

07-25-2005, 09:17 PM	#12
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	check out my user title that's all I have to say! __________________ 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car

07-26-2005, 07:10 PM	#13
Lobo'74 Registered User Join Date: Nov 2002 Location: Charlottesville, VA Posts: 404	350 Chevy V8, 4-bolt mains, with the following mods: Machining work done by Terry Walters precision engines, Roanoke, VA. Bored .030 over = 355 cubic inch Align bored Parallel top of block New cam bearings New freeze plugs New hypereutectic pistons, flat top Reconditioned connecting rods Crankshaft main and rod journals ground .010 under Rotating assembly balanced Double roller timing chain Melling high volume, high pressure oil pump (Melling M55-HV oil pump?) Speed Pro cam: Intake 224 deg dur, .450â€ lift; Exhaust 224 deg dur, .460â€ lift New hydraulic lifters and push rods World Industries part #012250-1 Sportsman II cylinder heads with 72cc chambers (9.5 to 1 compression), stainless steel valves 2.02 intake, 1.6 exhaust, heavy-duty valve springs, screw-in studs, guide plates Crane part #11744-16 roller rocker arms (Rollers on both fulcrum and tip) EdelbrockÂ* # 1470 750 CFM 4-barrel carburetor Edelbrock performer RPM aluminum intake manifold HEI distributor (Late-70â€™s style) Dyna-max Headers Â* Note: For correct tune-up parts, such as spark plugs, cap, rotor, coil, plug wires, use parts made for a 1979 Chevy C10 pickup 350 Cu in. engine. This also applies to accessories such as the alternator, water pump, thermostat, radiator, clutch disk, pressure plate, throwout bearing, and transmission. The power steering pump and gearbox are from a 1985 Chevy truck. Previous Owner rebuilt it and set it up. He said with the work done on it and the balanced rotating parts it has a 6500 red line. I've had it there maybe twice. I use 6000 as the red line and usually shift at 5500 or so. It pulls very strong all the way to 6500. I just don't want to over rev it and have the engine eat itself. __________________ "Truck" '67 small window '79 350 .030 over, LT1 "clone"

07-26-2005, 07:38 PM	#14
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	638 Dart Got It Set At 7200 Rpm......

07-27-2005, 12:00 AM	#15
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	Dyno flattened at 6800 but I shift at 6500 ish. Hard on the syncros much higher than that... __________________ 1968 C10 build in process TT LSA/6L90e/9"



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07-27-2005, 12:38 AM	#16
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	mine sees 5500 atleast once every time i drive it __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

07-27-2005, 12:58 AM	#17
71Dragtruck Registered User Join Date: Jun 2004 Location: Saskatchewan, Canada Posts: 1,368	BBC shifting at 6800, rev limiter set at 7200, but I do have a couple of aftermarket parts.

07-27-2005, 08:14 AM	#18
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	406 I built in a 77 Impala back in HS. redline unknown, I hit just over 8K MANY times. add in the 2.28:1 gears & all the open interstate one could ask for. I guess I was trying to duplicate Allinson's Talledega scenario (dumba$$ me). I just cant figure out why the TH350 trannys kept spitting parts. huh?! but your problem sounds like you need to tune the trans governor. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

07-27-2005, 11:00 AM	#19
bowtie Senior Member Join Date: Dec 1999 Location: Saskatchewan Posts: 1,050	396 shifts @ 6200 rpms. __________________ ~70 GMCprostreet swb 396/700r NOS 575 hp "the Brick" ~72 chev swb w/68 front clip "GM Millenium corvette yellow" I use and accept Paypal

07-27-2005, 07:13 PM	#20
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	Mine redlines after 70. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

07-27-2005, 08:35 PM	#21
XXL Señor Member Join Date: May 2002 Location: Edge of the world Posts: 5,367	Red line? What's that? /250 & 1-bbl //calc shows 2539 RPM at 55mph... need a tach to verify __________________ Craigslist \| ebay \| Engrishtees \| www.myattitudesucks.com \| Follow me on Twitter

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