[IYAS9YAS]

What model? Corvette, Chevelle, or land yacht?

[Eric in the Ozarks]

Caprice. The 396 was rated at 425 horsepower but was closer to 525. I think insurance had something to do with this. All but the tube headers were stock GM issue.
I learned that these big blocks can't take a hard whipping like the small blocks. One day, the big motor shook hard and "boom." A trail of oil followed me to the side of the highway.