A quick net search shows that the Toyota engines don't even closely resemble a Chevy from the outside. Bore and stroke and some internal features like 4 different size main bearings are close to the Chevy design, but the cylinder head and combustion chambers resemble a GMC,engine, not a Chevy.
Jerry

"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!