Finally got my project car running - http://www.youtube.com/watch?v=zv8kNY3CjQg
It is basically a freshly rebuilt clone of a stock '67 Z28 302. Stock block, crank, rods, pistons, cam, heads, etc. Carb is a stock re-issue carb I asked about here: http://www.camaros.org/forum/index.php?topic=10127.0
It came with what I believe are the stock jets, 68 primary and 76 secondary, and likely stock power valves, accelerator pump and cam, vacuum secondary spring, etc. I'm not allowed to change any of those parts in the class I'm building the car for. Here's an example of the sort of racing it is: http://www.youtube.com/watch?v=zUs_rZ-Psf8
The car has Doug Thorley tri-y 1-5/8" headers (mid-range torque is more important than top-end HP for what I do), a 2.5" Magnaflow exhaust with x-pipe, and a high-end Mallory distributor and coil. Has 100 octane in it at present, I have no problem running that long term.
Looking for advice from the group here - suggestions on initial timing advance, total advance? I have some flexibility in advance curves, mechanical and vacuum. (manual here: http://prestoliteweb.com/Portals/0/downloads/mallory/pdf/Mallory_Instructions_max_fire_1248214_1248204_1255104_1255404_1256704.pdf
- I'm using the curve that has 6 degrees advance at 2000, and 19 at 5200). Also have initial timing at 12 degrees but really have only started it a couple times and haven't done a basic idle tune yet. Vacuum gauge is on its way. At present it has a bit of a stumble off idle, even though idle seems rather high (12-1500rpm). My engine builder suggested this advance curve, but I forget where we had initial timing when it was on the engine dyno. I suppose to get to the normal 36 degrees total, would need 17 degrees initial? Need to have a timing approach that is safe considering the car will probably be lean most of the time with stock jets.
Looking for suggestions on adjustments I can make to the carb (idle, float levels, etc.) to help it perform under a transient-throttle racing situation? What I do is a lot different than drag racing; we are part-throttle most of the time and need good transient response. Looking at some kind of tube to run between the primary and secondary bowl vent extensions, to keep the carb from flooding under heavy braking, which would be allowed since it's not an internal modification.
Thanks so much again for the help!