hi all,I am having afew problems tuning the 350 chev in my boat and this looks to be the perfect place for some info...after all, the chev is all american iron and specs are hard to find here in new zealand.
Engine specs are:
comp ratio approx 9.2:1
world products torquer heads
94 octane fuel
600 vac sec holley
.470" lift cam (all cam specs unknown,came with block)
Vac advance is connected to the fitting on the primary metering block on the carb,
After a full rebuild and installing a HEI dizzy, I took it out on the water today to tune the carb and timing..
The following are the timing results,
6 deg ATDC at 1000rpm(idle) vac disconnected,
17 deg ATDC at 1000rpm with vac connected,
32 deg ATDC with throttle wide open.
It runs ok but when you puch the throttle from idle it back fires through the carb and dies, if you throttle up slowly it gets up and goes ok..
Also i have noticed that with the throttle wide open while planning the secondaries on the carb are hardly open, if at all..
Any help would be greatly appreciated...