Originally Posted by vern0116
Maybe I didn't explain it enough or the right way. the motor was a 454 it was bored out .60 to a 4.310 bore and has a 4.350 stroke.
Your explanation left a lot out, initially your stated it was bored
to 510. We still don't know how you timed it with #1 cylinder not firing.
Also, if the valves were being held open you would have had major backfiring either through the intake or exhaust, depending on which valves.