I have 3 HOlleys to play with.
The car- 66 SS 396/425- 9.5 comp, 3400lbs, m22, 373 gears. crane energizer 282, 108lsa. 208 rec port heads
In Colorado at 5000'.
Current carb-4776- 4150/600cfm down jetted primary for altitude 63/76.
mech secondaries- Runs well. Crisp throttle response.
Possibillities- 4778-4150/700cfm- jets 66/76. mech secondaries- Rebuilt and
runs well. Crisp throttle response.
- 3310-12/ 750 vac sec. stock jets . quicker spring in diaphram.
GM had this on as original but a 780cfm.
a bit sluggish out of the hole. Going to try down jetting the
primary's for altitude and test.
Any insight would be appreciated.
So far I'm leaning towards the 600-4150. Have to look at the plugs a bit closer too.
Last edited by boyd66k20; 11-22-2018 at 10:15 AM.