Initial timing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ackattack · 11-07-2002, 06:09 PM

can anybody give me a suggestion as to what timing I should have?

I have a 327 with a Comp High Energy 268H. I've played around with it, and thought I had it dialed in at about 6 degrees BTDC and this morning it back fired, so I'm thinking I need to adjust it a little.

crazy longhorn · 11-07-2002, 06:17 PM

i would suggest 12-14 initial, & 34 total all in between 2500-2800 with the vac advance un hooked. Try to limit the vac advance to about 10 degrees, & hook to full manifold vac at the carb. that should get you in the ballpark, but ea combo tunes a little different, so you may have to play a little. Good luck

**COBALT** · 11-07-2002, 06:42 PM

I make it a practice to advance the distributor as far as it will go (with the engine running) until it starts to run rough. Then I back it off a little. Then I make sure there's no stumble in the acceleration.

Ackattack · 11-07-2002, 06:54 PM

thanks guys

crazy longhorn · 11-07-2002, 07:06 PM

good luck dude.....just listen to what the engine wants(it kinda like dealin with the wifey)

bigjimzlll · 11-07-2002, 07:31 PM

good advise...it may be difficult to limti the vacuum advance to 10 degrees, unless you have a stop on it and an adjustable can...my engine likes 12 degrees initial with 12 degrees vacuum(full manifold vacuum) and 36 total all in by 2700..most vac cans are around 20-22 deg ...so it gets a little tricky

Ackattack · 11-08-2002, 12:28 AM

Well I looked at it tonight and figured out the problem. It was set at 2 degrees ATDC!! The bolt was loose, and must have vibrated around to that. I set it back at 6 degrees, tightened the bolt and all is good.

11-07-2002, 06:09 PM	#1
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Initial timing can anybody give me a suggestion as to what timing I should have? I have a 327 with a Comp High Energy 268H. I've played around with it, and thought I had it dialed in at about 6 degrees BTDC and this morning it back fired, so I'm thinking I need to adjust it a little. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

11-07-2002, 06:17 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	i would suggest 12-14 initial, & 34 total all in between 2500-2800 with the vac advance un hooked. Try to limit the vac advance to about 10 degrees, & hook to full manifold vac at the carb. that should get you in the ballpark, but ea combo tunes a little different, so you may have to play a little. Good luck __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

11-07-2002, 06:42 PM	#3
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	I make it a practice to advance the distributor as far as it will go (with the engine running) until it starts to run rough. Then I back it off a little. Then I make sure there's no stumble in the acceleration. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

11-07-2002, 06:54 PM	#4
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	thanks guys __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

11-07-2002, 07:06 PM	#5
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	good luck dude.....just listen to what the engine wants(it kinda like dealin with the wifey) __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

11-07-2002, 07:31 PM	#6
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	good advise...it may be difficult to limti the vacuum advance to 10 degrees, unless you have a stop on it and an adjustable can...my engine likes 12 degrees initial with 12 degrees vacuum(full manifold vacuum) and 36 total all in by 2700..most vac cans are around 20-22 deg ...so it gets a little tricky __________________ 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

11-08-2002, 12:28 AM	#7
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Well I looked at it tonight and figured out the problem. It was set at 2 degrees ATDC!! The bolt was loose, and must have vibrated around to that. I set it back at 6 degrees, tightened the bolt and all is good. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index Last edited by Ackattack; 11-08-2002 at 12:36 AM.

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