The Struggle
Member
- Joined
- Jan 13, 2015
- Posts
- 38
- Reaction score
- 84
- Location
- Converse, TX
- First Name
- Blaine
- Truck Year
- 1981
- Truck Model
- K10
- Engine Size
- 350
Does anyone know if my timing could be too retard if my initial timing made my truck backfire through the carb (12 degrees initial/ 36 total)under load? I reduced the backfiring ALOT if I kept advancing the timing every time I test drove it and tightened the timing curve springs to one stronger one. I'm now at 18 degrees initial/36 total but have to hold my foot to the floor to start the truck now on a hot start after letting it rest for a bit. It doesn't slow the starter or give any too advanced symptoms when starting just is stubborn and runs rough for about ten seconds. This is in a performance 350, aluminum heads, Holley 650 vacuum secondaries. Cam is SUM-1107 224/234 duration, .466int/.488exh. 114 LSA, Compression ratio is a 9.6:1 with 64cc heads. BTW it backfired WAY more when I retarded it down to 8 degrees initial! Vacuum canister is hooked to ported (above throttle blade source and limited to 11-14 degrees advance on the armature).
I'm lost, should I keep advancing and hope not to ping the engine or go another route? My exhaust is pretty much straights with dumped thrush glass packs 4 feet behind the headers so its right underneath the cab which drones and is loud. To loud to hear any possible pinging I think.
This truck is driving me insane!
I'm lost, should I keep advancing and hope not to ping the engine or go another route? My exhaust is pretty much straights with dumped thrush glass packs 4 feet behind the headers so its right underneath the cab which drones and is loud. To loud to hear any possible pinging I think.
This truck is driving me insane!
