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Pontiac1971 400, bored .060, sonic testing done and will go.070,and.080 Easily on next builds. And yes I can get pistons. I am currently building 2 ,428 one is .040 2 bolt. One is .130 over 4.25 bore 4 bolt ,all sonic tested and good to go. This 400 Block has been decked ; line honed,
96 heads Medium plus port job. Intake port matched.milled along with intake.Cam
[email protected] int &exh. lift .450 int; exh, 110 lob. Forged eagle rods cast pistons. One piece rear main seal All broke in , oil changed analyze. All great. 8.5 compression, And compression test done,all holes 140, runs on medium grade. doesn’t come with carburetor, pulleys starter, exhaust manifold, our distributor and wires, does come with Water pump, fuel pump, flex plate.spark plugs.Go on YouTubeti hear it run type in Pontiac 1971 Gto 400 XX.estimate torque 450, horsepower 375+.