Timing Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gary2232 · 10-02-2010, 10:51 AM

1972 chevy 350 stock with a RV cam, HEI, and 5000 miles. I was told to set timing at 8 degrees but it has no power there I went to 12 but still not good. Could I be a tooth off on the distributor?? What is a good set point for timing??/ Also just installed new 1406 edelbrock.

oldblue1968chevy · 10-02-2010, 04:33 PM

between 8-12 on stock motor for initial timing (vac. adv. plugged)

Put #1 piston at TDC compression stroke (blows your finger off hole) drop in dizzy so that rotor is pointing at #1 sparkplug wire tower

LONGHAIR · 10-02-2010, 07:43 PM

Quote:

Originally Posted by gary2232

I was told to set timing at 8 degrees but it has no power there I went to 12 but still not good. Could I be a tooth off on the distributor??

If you can time it with a light to a specific degree and the vacuum cannsiter is not bumping into something.....you cannot be "a tooth off". All that one tooth can do is change the relative position of the housing at any given degree of advance.

GASoline71 · 10-02-2010, 09:19 PM

What "RV" cam?

"RV" is too universal when it comes to decribing a cam.

Gary

*Ticker* · 10-02-2010, 09:27 PM

It's more likely the advance mechanism causing lack of power than the initial timing. There's a long-winded but accurate post linked below that is the right place to start.

http://67-72chevytrucks.com/vboard/s...d.php?t=290498

Then you can take a look at the carb...although since you just installed it it's worth checking right away that the butterflies are vertical at full throttle from the pedal.

gary2232 · 10-02-2010, 11:00 PM

Ok you are all correct. The timing was way advanced. I was checking with vac advance connected. Its running OK now just a little rough at first acceleration. Some more carb adjusting will fix that. Sorry about the RV cam term. Will check into that. Once again this forum has come through for me. Thanks

**VetteVet** · 10-02-2010, 11:11 PM

Quote:

Originally Posted by Ticker

It's more likely the advance mechanism causing lack of power than the initial timing. There's a long-winded but accurate post linked below that is the right place to start.

http://67-72chevytrucks.com/vboard/s...d.php?t=290498

Then you can take a look at the carb...although since you just installed it it's worth checking right away that the butterflies are vertical at full throttle from the pedal.

This post is a sticky at the top of the engine forum.

10-02-2010, 04:33 PM	#2
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Timing Question between 8-12 on stock motor for initial timing (vac. adv. plugged) Put #1 piston at TDC compression stroke (blows your finger off hole) drop in dizzy so that rotor is pointing at #1 sparkplug wire tower __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

10-02-2010, 09:27 PM	#5
Ticker Account Suspended Join Date: Oct 2009 Location: Sammamish, WA Posts: 2,404	Re: Timing Question It's more likely the advance mechanism causing lack of power than the initial timing. There's a long-winded but accurate post linked below that is the right place to start. http://67-72chevytrucks.com/vboard/s...d.php?t=290498 Then you can take a look at the carb...although since you just installed it it's worth checking right away that the butterflies are vertical at full throttle from the pedal. Last edited by Ticker; 10-02-2010 at 09:28 PM.

10-02-2010, 11:00 PM	#6
gary2232 Registered User Join Date: Jul 2008 Location: Tracy Ca Posts: 171	Re: Timing Question Ok you are all correct. The timing was way advanced. I was checking with vac advance connected. Its running OK now just a little rough at first acceleration. Some more carb adjusting will fix that. Sorry about the RV cam term. Will check into that. Once again this forum has come through for me. Thanks

10-02-2010, 10:51 AM	#1
gary2232 Registered User Join Date: Jul 2008 Location: Tracy Ca Posts: 171	Timing Question 1972 chevy 350 stock with a RV cam, HEI, and 5000 miles. I was told to set timing at 8 degrees but it has no power there I went to 12 but still not good. Could I be a tooth off on the distributor?? What is a good set point for timing??/ Also just installed new 1406 edelbrock.



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