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First few pics were the engine as I found it, complete with 9 bent pushrods, stuck valves, a valley full of mouse nest, and the dead mouse in the pan... Hence the thread title...lol. Last one is it on the running stand. Yesterday I broke in the camshaft and did some basic tuning, ran it for a...

I've picked up a mid 70s RV 413 shortblock. It's got a smaller diameter, but thicker harmonic dampener on it. Supposed to be steel crank & internally balanced... Has anybody swapped the timing cover and balancer on these to an earlier forged crank unit?