This listing is for a set of (8) Speed Pro Power Forged Domed head .265" high and matching Hastings Moly rings compatible with 1970 Chevrolet 454 with closed chamber heads V-8 - 4.280" bore (at +.030"). Compression ratios: w/100.9cc chambers 11.89:1, w/106.9cc 11.18:1, w/109.4cc 10.91:1, w/119cc 10.01:1. Pin diameter: .989" (included). Press fit only pins. Stock 6.135" length rods. Stock 4.000" stroke.