I'm working on a modification to the 235 piston that involves moving the wrist pin lower in the piston with an offset bushing. The NASCAR rod has a smaller diameter wrist pin than the stovebolt rod, so a bushing would be required anyway. By opening the pin bore up to 1" diameter and offsetting the new pin hole in a bronze bushing toward the bottom, the piston comes closer to the top of the cylinder. I'm in the process of machining such a piston now. If a prototype engine with that setup survives dyno testing, a custom built piston with the proper compression height could be commissioned.

The ideal piston for this application would have a 3 5/8" bore and a compression height of 2 9/32" (2.281") The wrist pin diameter of the NASCAR rod is 0.787", but that can be dealt with by putting a bushing into the pin bore of a piston with a larger pin hole. I'm adapting a set of 305 Chevy pistons with a .927 wrist pin to that same size rod by making bronze bushings for the pistons.
Jerry




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