AyWoSch Motors
The Parts Guy
- Joined
- Nov 6, 2020
- Posts
- 4,690
- Reaction score
- 13,695
- Location
- New Mexico
- First Name
- Ayden
- Truck Year
- 1986
- Truck Model
- K1500 Sierra
- Engine Size
- 350ci V8
Hello there.
I have a 454 big block with a few modifications in my 75 K5 and was wondering what proper timing should be.
It's a 74 block out of I believe an old impala wagon. It was rebuilt in the mid 90s, but no major performance parts were added.
I bought it last year, and right now it has open long tube headers, a carter 850cfm performance carb, on a half inch open carb spacer, and every accessory taken of the engine, except the alternator.
It has brand new air filter, new plugs, new plug wires, mechanical choke cable, and runs on normal pump gas.
When I first got it, it was so far out of time it would barely run except to rev it out, right now I have to set to between 12 and 14 btdc.
It starts right up, and runs well, but when your driving it and get it up above about 3500 or 4k sometimes it will pop and sputter and bog, and lunges a bit like I have the choke on full, but it isn't.
Please help.
I have a 454 big block with a few modifications in my 75 K5 and was wondering what proper timing should be.
It's a 74 block out of I believe an old impala wagon. It was rebuilt in the mid 90s, but no major performance parts were added.
I bought it last year, and right now it has open long tube headers, a carter 850cfm performance carb, on a half inch open carb spacer, and every accessory taken of the engine, except the alternator.
It has brand new air filter, new plugs, new plug wires, mechanical choke cable, and runs on normal pump gas.
When I first got it, it was so far out of time it would barely run except to rev it out, right now I have to set to between 12 and 14 btdc.
It starts right up, and runs well, but when your driving it and get it up above about 3500 or 4k sometimes it will pop and sputter and bog, and lunges a bit like I have the choke on full, but it isn't.
Please help.