A little bit about my engine. It's a 239 from a car, it was in when I bought it in '78. It's been bored + .125. I used standard bore 256 Pistons until 2 years ago. I got a 312 crank and had the mains turned down to 239, 272, 292 size. Reassembled it with 312 rods and 272 standard bore Pistons. Edelbrock 354 intake and G heads. Dennis