Did one many years back and the costs were stupid, but the customer didn't want to listen. Grind crank pin down to 2.1, (may as well just offset grind for a 3.7 stroke) machine down side of big end on rods, chamfer or buy chamfered bearings and as Chuck said has an adverse affect on 4V heads. As was said the 302 Cleveland connecting rod is 6.025 high and you could machine out the little end out .015 thou to .927 if you really wanted too. This is an old trick for the 351 2V engines running 302 Cleveland rods, but the price of Pistons is crazy. Actually got a set from years ago sitting down the back that S'd a rod when a casting fault from the SSR of the head (at least 150+ runs on those heads) fell out and filled the cylinder full of water. I thought something went about half track but back in the pits it was running ok then started getting real hot, obviously no water in the system. Pulled it down and piece nearly the length of the SSR and nearly 1/8 inch wide went missing, lol. For the stuffing around and costs, be cheaper buying a stroker kit these days.
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I appreciate the information on the 6" rod builds. I totally agree the stroker kits are very reasonable now days. Sometimes I like being different. I will know which direction the build is going once the engine is torn down and assessed. The Aussie 302 rod I did not know about, thanks.