Join Date: Dec 1999
Location: Salem,Oregon USA
Still trying to sort out problem(s) with 331, Speed Pro 9.4-1,s, Comp XE 274, Holley Street Dominator/ 80508 vac sec (68 in primaries, .31 sqirter), Sportsman II, Hokker Super Comps (1 5/8), small body HEI 10 initial 34 total @2400.
Car backfires through carb when floored.
Should I be concentrating on carb and fuel delivery, or looking at some tweeks on timing?
Also, with a non-fluid damped fuel pressure gauge, does the gauge flutter (with car running)?
Don't have a lot of vacuum (9" @ 900 rpm,s).
Car runs good when you ease into throttle but backfires when quickly floored.
What should I be looking for?