Need some expert advise on timing!
Thread Starter
Instructor
Joined: Jan 2009
Posts: 193
Likes: 0
From: NJ
Need some expert advise on timing!
I just finished my rebuild on my 75 vette and I am hoping someone out there has a similar set up to mine and can give me an idea where I should have my timing.
My current mods- Edelbrock performer RPM heads, Edelbrock Performer intake manifold, 650 CFM Carb, Comp Pro-Magnum roller rocker arms, Comp 268h cam, Flat top pistons .030 bore - 10.1-1 comp ratio., hooker headers, flowmasters exhaust, 3.70 gear ratio, 2400 torque converter, March aluminum pulleys, & double strike electronic ignition.
I am hoping to have over 350 hp in the end after I get the tuning all set up, that sound about right?
Thank you!
My current mods- Edelbrock performer RPM heads, Edelbrock Performer intake manifold, 650 CFM Carb, Comp Pro-Magnum roller rocker arms, Comp 268h cam, Flat top pistons .030 bore - 10.1-1 comp ratio., hooker headers, flowmasters exhaust, 3.70 gear ratio, 2400 torque converter, March aluminum pulleys, & double strike electronic ignition.
I am hoping to have over 350 hp in the end after I get the tuning all set up, that sound about right?
Thank you!
Advanced
Joined: Nov 2005
Posts: 96
Likes: 0
From: Baton Rouge Louisiana
Check out the post at the top of the page:
"Info on Timing, Long Post" by BarryK
Print it out along with a visit to his home page for the other papers
offered there. A few minutes with this information and you will know exactly what to do.
"Info on Timing, Long Post" by BarryK
Print it out along with a visit to his home page for the other papers
offered there. A few minutes with this information and you will know exactly what to do.
Le Mans Master
Joined: May 2002
Posts: 5,086
Likes: 787
From: Lebanon Township New Jersey
Some similarities between my set up and yours. You want total advance, with vac plugged, at 36 deg. Use light springs so it comes in early. Hook up your vacuum after you set the timing. BTW - I'm using an Edel Performer manifold. It can't be that bad.
Thread Starter
Instructor
Joined: Jan 2009
Posts: 193
Likes: 0
From: NJ
Thanks alot...what kinda power do you think your running?
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Advanced
Joined: Nov 2005
Posts: 96
Likes: 0
From: Baton Rouge Louisiana
idle.
Instructor
Joined: Feb 2006
Posts: 240
Likes: 0
From: Allentown PA
MTC 75- (1)- There is an excellent article right here on the forum about timing your engine...look to the top middle of the page and click on "other" then "tech tips" then "C3" and check out all the articles.
(2)-Check out this site for horsepower combinations, over 100 listed, one might be close to your setup. Ryanscarpage.50megs.com
(2)-Check out this site for horsepower combinations, over 100 listed, one might be close to your setup. Ryanscarpage.50megs.com
Pro
Joined: Dec 2006
Posts: 665
Likes: 0
From: wilmington nc
First off i"m no expert on timing, but i doubt seriously if 10.1-1 cr with a small duration cam like the 268H is going to like 36-38 degrees of timing. I do not have edelbrock heads, so i cant help you. I run dart heads, an dart recommends 32-34 degrees of timing. 36-38 is not a magic number for all engine combo"s. Start out with 32 degrees timing an slowly advance it till you hear the dreaded ping, spark knock, valves ratteling, whatever you want to call it. Once you hear that, back off the timing 2 degrees. Your pistons will thank you.
I run 10.1-1 cr an a much larger cam than you have . i just do get away with 34 degrees.
I run 10.1-1 cr an a much larger cam than you have . i just do get away with 34 degrees.
Race Director
Joined: Jun 2000
Posts: 10,046
Likes: 675
From: FL
Edelbrock RPM Q-Jet part #7104. Probably the best dual plane for the Q-Jet. Flows better than the Performer.
I am using the stock Q-Jet, just made a new fuel line to accomodate the increased height (search for "Lars fuel line" for directions). Replaced the hot air choke with an electric choke. Google "electric choke" Q-Jet for a kit.
Edelbrock will tell you that the 7104 does not fit the Corvette.
I am using a Moroso Low Profile Racing Aircleaner. 14x3" filter. Barely touches HEI. Just had to dimple the base a bit for the accelerator pump arm. 3/4" clearance between aircleaner and stock hood.
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