white smoke on initial start up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 02-03-2007, 01:10 AM

i just started up a rebuilt 350 with vortec heads. as soon as i got it running, i reved it to 2000 reguardless of the timing. i tried to put it at the best timing to let it run. the exhaust was pumping out a slight white smoke that didnt smell like coolant and i didnt see any bubbles in radiator. the temp rose to about 195 and started to climb, which i assumed that the bad timing was the reason of the hot temp. the exhaust not sounded off to. tomorrow im going to start it back up, let it idle, and set the timing. what do yall think?

jhow66 · 02-03-2007, 01:12 AM

Normal. Run it awhile then see what it does.

bigblockorange · 02-03-2007, 01:55 AM

could be water left in the exhaust. play with the timing quickly and finish braking in the cam it should be alright.

1BadSS · 02-03-2007, 08:54 AM

Could've bent a valve from the wrong cam timing.

*rage'nrat638* · 02-03-2007, 09:59 AM

what kind of rockers are on this engine? they should be self aligning rockers,
on vortec heads. just a FYI

theres a few limits on cam lift and spring seat pressure with stock vortec heads without mods.

the first two pictures show self aliging rockers the last one is a reg style rocker.
hope you get it worked out.. your pal mark

crm318 · 02-03-2007, 01:16 PM

yea, im using the self aligned rockers. the cam is .440/.440 lift which is under the .450 limit

02-03-2007, 01:10 AM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	white smoke on initial start up i just started up a rebuilt 350 with vortec heads. as soon as i got it running, i reved it to 2000 reguardless of the timing. i tried to put it at the best timing to let it run. the exhaust was pumping out a slight white smoke that didnt smell like coolant and i didnt see any bubbles in radiator. the temp rose to about 195 and started to climb, which i assumed that the bad timing was the reason of the hot temp. the exhaust not sounded off to. tomorrow im going to start it back up, let it idle, and set the timing. what do yall think? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

02-03-2007, 01:12 AM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: white smoke on initial start up Normal. Run it awhile then see what it does. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

02-03-2007, 01:55 AM	#3
bigblockorange Senior Member Join Date: Jan 2007 Location: central pa Posts: 428	Re: white smoke on initial start up could be water left in the exhaust. play with the timing quickly and finish braking in the cam it should be alright.

02-03-2007, 08:54 AM	#4
1BadSS NOT REALLY BANNED! Join Date: Jul 2004 Location: Shawnee, KS Posts: 1,072	Re: white smoke on initial start up Could've bent a valve from the wrong cam timing. __________________ 1987 Mustang Coupe - 2.7 Stroker, 78mm turbo, Stainless header, 3" Exh, FMIC, 160lb/hr Injectors, MS3, twin walbro 255's, 34psi. Eating V8's daily. 04 Pontiac GTO 04 Ford Mustang GT 68 C20 LWB stripper truck 73 K5 Cheyenne 76 C20 Sierra Crew SRW 88 K20 Suburban I'm not hammering on metal just to hammer, i'm creating a piece of art.

02-03-2007, 09:59 AM	#5
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: white smoke on initial start up what kind of rockers are on this engine? they should be self aligning rockers, on vortec heads. just a FYI theres a few limits on cam lift and spring seat pressure with stock vortec heads without mods. the first two pictures show self aliging rockers the last one is a reg style rocker. hope you get it worked out.. your pal mark Last edited by rage'nrat638; 07-12-2007 at 06:58 AM.

02-03-2007, 01:16 PM	#6
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: white smoke on initial start up yea, im using the self aligned rockers. the cam is .440/.440 lift which is under the .450 limit __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies



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