I'm old (52) but new to this forum stuff.
I have just finished building a dream and it started. I had a 69 Camaro when growing up and have recently got another.
Anyway, a Question. I started the motor for the first time in the car. It was broken in on a dyno. The motor is a 434 Chevy Big Block. (396 - bored- with 454 crank) The motor runs real strong. I warmed it up to make sure there were not leaks and all was well. Oh happy day. Then I tried to shut it down. It would not. The predetonation was consistant until I put it in gear and feathered the clutch to load the motor and it turned off. I thought the timing to be too advanced so I broke out the light. I set the timing at 10 degrees advanced as it was up around 25 or more degrees. I thought all was well until I tried to shut it down again. Still detonating. There is a mild street cam in the motor and I'm trying to get the specs from the builder. Should I be experiencing this predetonation with a 12 degree setting on the motor? The factory setting is only 4 degrees for a 396/375. I would expect more from this motor. Can anyone help or offer some suggestions? Thanks