He's probably using the Chevy 262 crankshaft- - - -3.1" stroke, 4" bore, and 350-sized main and rod bearings. 311 cubic inches, and it can be built with mostly "over the counter" parts.

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!