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Discussion Starter #1
I am currently working on putting new springs and weights. I have a kit made by moroso. I planned on putting the lighter chrome springs on, but want to know how this will really affect my car. I have a 76 camaro with a edelbrock 600 cfm carb and performer intake manifold, supercoil, and a mild comp cam. timing is currently at [email protected] approx. 14 degrees advanced, timing marker is one inch above my timing tab. This was set by a local mechanic. I think the timing is off though because comp cams specified about 8 to 12 degrees advanced. Thanks for any help
 

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1 inch above your timing tab? Do you have one of those tabs that just have one mark, instead of marks for 2 ATDC through 12 BTDC? If you have the latter type, you have more like 20 degrees.

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1969 Base Camaro
Vortec 355, Perf. RPM, Demon Carb., TH-400
All sheetmetal is NOS GM
See my NEW webpage at: http://www.geocities.com/compuboy007/
 

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[I have a timing tab like you mentioned with 2 degrees to 12 degrees. If the timing is at about 20 degrees, I think its too advanced maybe. The car runs good although it has a smell like it is running rich. I had taken the car to be dialed in, and the mechanic said my timing tab was wrong, but it is a chevy sbc timing tab. I think I am going to reset the timing and idle setting myself. It should be at 8 to 10 degrees advanced at 650rpm according to comp cams. Thanks for your info.
 

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The weights and springs control the mechanical advance. If you're running a fairly low geared '76 then you want around 34 to 36 degrees of total advance (initial + mechanical) with the vacuum advance disconnected. This is where a timing light with an advance dial comes in handy. Set the light at 34 or 36 and have someone slowly rev the engine until the timing mark lines up with 0 on the tab. With a mildly modified engine you want to get there somewhere around 2800 to 3000 RPMs. If it pings at part throttle you can either put stiffer springs in or buy an adjustable vacuum advance canister.

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'69 RS Camaro
355 5-speed 4.11
 

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Please do not forget to unhook and plug the vacume hose going to the vacume advance when you check initial timing at idle.
 

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Is your timing tab correct? The tab and the "0" mark moved 8 or 9 degrees counterclockwise (as viewed from the front) in '69 (along with the index mark on the balancer). I'd get a piston stop and verify exactly where TDC #1 really is on the timing tab before trying to tune it, especially if it's a bolt-on timing tab (vs. the production welded tab); you never know - Bubba is everywhere.

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JohnZ
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'69 Z28 Fathom Green
 

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Discussion Starter #8
Hey, thanks guys for all the information, I am going to definitely check out the timing tab issue. I do believe it is the right one though, I checked when I installed my new comp cam 265 deh, and had piston 1 at tdc. It never hurts to double check though. I will also check timing again, and set it to spec. Thanks for all the info. I really appreciate it.
 

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Hey, thanks guys for all the information, I am going to definitely check out the timing tab issue. I do believe it is the right one though, I checked when I installed my new comp cam 265 deh, and had piston 1 at tdc. It never hurts to double check though. I will also check timing again, and set it to spec. Thanks for all the info. I really appreciate it.
 
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