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Ok, my dad and I are about to put together my motor for my 73 240z and we have no clue how much power this motor will make. The head is rebuilt to stock its a 1973 E88 head. We have the Z Car Source master rebuild kit with .040 over flat top pistons, the pistons dont work with the head so we are having valve reliefs cut...we found this issue once we had the pistons and most internal in, check the clearance with #1 at TDC and the valves are coming in contact with the piston. Mods are; over bore(.040), header and AZC 4 barrel manifold/Holley 390. Any guess on horsepower at the crank would be greatly apreciated, I am geussing around 175hp at the crank. Thanks for any help.
