R1 block, 4.090" bore, 4.125" BPE crank w/ 2.00" rod journals, 6.125" Comp Star rods, Diamond flat top pistons, 1.5mm, 1.5mm, 3.5mm ring pack 11.2-1, ported Indy 360-1 heads and Indy intake, 1050ish Thumper built 4150 carb, Comp solid roller 263/271° @.050", .711/.719" at the retainers, Pac springs, T&D 1.7 rockers, Hedman 1 7/8" headers. It runs on pump 93.