These pistons are a 4.350" (.030 over) bore flat top piston which will work in a 440 block with our 4.15" stroke and 6.76" rod "500CI" stroker combination. All our platinum pistons use 1/16, 1/16, 3/16 ring pack for less frictional loss, and weight saving, full floating .990 pin size. Our table below lists detailed compression ratios:
    
      
        | Bore Size: | Dish (-) or  Dome (+) CC's | Compression Height: | Distance Below Deck: | 65CC | 72CC | 75CC | 78CC | 84CC | 86CC | 88CC | Part#: | 
      
    | 4.350 
    (.030 over) | -4 (FT) | 1.867" | -.018" | 13.09 | 12.16 | 11.80 | 11.47 | 10.85 | 10.67 | 10.48 | 5093 |