i have a 1969 350 chevy block i'm trying to find out how much horsepower i have i have checked the casting numbers but the last number that's supose to be on the front by the head is gone.... the casting number is 3970010 date code is G 17 8
now there's one more thing thing the piston has a code on it 3959456 what is that code mean....please help if you can thank you