Hi,
I have a 1992 that I've swapped the engine with a 305 out of an 84 camaro. I don't know everything that was done to the engine, as I got the car because it was abandoned. I do however know it has 0.030 over pistons as well as a mild cam. Also running an edelbrock 600
The issue I'm having is that if I set the ignition timing to 8 degrees the truck runs great and has loads of power. However at about 2000RPM it sounds like a bag of marbles under the hood. Running 91 octane fuel, have tried from different places. If I retard the timing to where it doesn't knock, it runs like crap, has no power/backfires etc.
I put lighter springs in the advance so it would advance at a lower RPM so I could maybe retard the total timing, which definately helped but not well enough.
I'm wondering if anyone has any input, maybe a colder spark plug? I should also add there is no EGR. At times, while it hasn't done it in a while (though I havent driven the truck all winter) it would run on sometimes after you shut it off.
Thanks.
I have a 1992 that I've swapped the engine with a 305 out of an 84 camaro. I don't know everything that was done to the engine, as I got the car because it was abandoned. I do however know it has 0.030 over pistons as well as a mild cam. Also running an edelbrock 600
The issue I'm having is that if I set the ignition timing to 8 degrees the truck runs great and has loads of power. However at about 2000RPM it sounds like a bag of marbles under the hood. Running 91 octane fuel, have tried from different places. If I retard the timing to where it doesn't knock, it runs like crap, has no power/backfires etc.
I put lighter springs in the advance so it would advance at a lower RPM so I could maybe retard the total timing, which definately helped but not well enough.
I'm wondering if anyone has any input, maybe a colder spark plug? I should also add there is no EGR. At times, while it hasn't done it in a while (though I havent driven the truck all winter) it would run on sometimes after you shut it off.
Thanks.