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After removing the 306 from the dyno, we set to work dismantling the test motor in order to swap the performance components onto the 347 short-block. It should be noted here that the 306/347 test did have one variable that obviously skewed the test results somewhat. In building the short-blocks, we had to make a choice between running the same flat-top piston or running different piston configurations in order to maintain the same static compression ratio. Everything else being equal, the added displacement of the 347 would increase the static compression ratio.