I've hot-rodded a 400. Rather than mill the decks I decided to do all the correction with the pistons since the dished pistons required replacement anyway. So I ordered up one custom set of forged pistons having flat tops with a 351C 4V valve notch, standard ring set, 400 wrist pin set up for a pressed pin installation and 1.685" pin height. These piston saved having to mill the decks, mill the heads, or install bushings in the rods for 351C pins. They gave the motor a nominal 0.030" deck clearance. I topped the block with standard head gaskets and 1972 Cobra Jet heads (open chamber) having nominal 75cc combustion chambers. The result was nominal 10.0:1 compression ratio. I installed a Shelby dual plane intake manifold with spacers, topped it with a 780 Holley from Ford. The cam was my usual D1ZZ-BX hydraulic cam. This was an unbelievably strong "muscle car" motor powering an F150 with 4.11:1 gears. No sign of detonation, no pokey performance. It was a beast.
-G
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If you use a 351C 4V powered vehicle for a grocery getter ... the eggs aren't going to make it home!
