One thing leads to another... mean 318?

Im aware of piston speeds and side loading and am not in the camp of high revving strokers. Also would like to see the notches in the 3.91 bore cylinders to clear the rod nuts. I had to nip my 4.00 bores to clear the stock rods on a 4.00 stroke crank...Iirc the cap bolts are smaller on an aftermarket forged rod. There is a point bore size wise where a 4" stroker crank is not going to fit, 318 is probably not one of them but a 273?
FWIW, Pista, I've fit up a 4" crank in a 273 and it'll take some very small bore notches. And yes, the cap bolts for the SCAT I-beam rods (and very probably the Eagles) makes the notches smaller. I am prety much done with that set up except for the valve to bore clearance. The LA-X heads would have been the best for those small bores but now the don't make them. Here is with a SCAT I-beam.

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