The specs I listed on the pistons and rings are what is listed JE on the boxes. As far as the compression ratio I was shooting for 9:1 myself. I'm no engine builder but I know alot of things can change your compression when biuding a motor.
Bore 4.000
Comp Height 1.850
Pin Dia. .940
Dish -.245
The compression Ratio was going to be around 8:5 to 9:1
I have a 4.1 block also but I oiled it up bagged it and put it in storage. I don't feel like degreasing it just for pics lol.. its the '291' block. It's the one beefier in the...
Brand New in the box Custom made JE Forged pistons with matching pins and Moly rings for a 4.1 block with a 4" bore. They are made to work with stock length rods.. $600.00 plus shipping ..