First Generation Firebird-L Mailing List ......................................................................... My experience with most HEI's have been that the springs for the mechanical advance are way too tight so that the max advance doesn't come in till way too late (high RPMs). You can buy a kit from Summit (or most other vendors) with different springs to adjust the curve so that you have maximum advance at 2-2.5K RPM. Also, make sure that your vacuum advance is connected to the correct ported vacuum port on the carb. Also with that tall gearing (2.78) it will make it great for the highway but not too good for off the line umph. Hugo
--- On Mon, 11/9/09, Jim <[email protected]> wrote: From: Jim <[email protected]> Subject: [FGF] Timeing - base advance To: "First Generation Firebird-L" <[email protected]> Date: Monday, November 9, 2009, 1:11 AM First Generation Firebird-L Mailing List ......................................................................... Finally got my car together enough to actually drive so I took it out for a spin. Power seemed way down, couldn't even break the tires and spin em and it would bog if you floored it, you could see gas mist coming back up out of the carb secondaries (no hood or air cleaner). I had set the base timing to about 8 degrees. I also replaced the factory distributor with an aftermarket HEI system. Looked up the specs in the manual and it says 9 for the reg 400 and 15 for the ram-air. So I bumped it up to 12 and took it back out. Ran a whole heck of a lot better and could easily spin the tires from a stop. Does it seem right that another 4 degrees of advance would make such a difference?? Now I'm thinking I might want to put a 3.08 rear gear in it instead of the 2.78 it's got. ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[email protected]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> Classifieds: <http://FirstGenFirebird.org/ubb/> Owner Pictures: <http://FirstGenFirebird.org/show/>
