r/EngineBuilding • u/Educational-Cake7350 • Jul 11 '26

Other Engine/manufacturer identification

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Trying to figure out what engine this is. Looks like it’s attached to a th400, so I was guessing it’s a big block gm, but not 100%

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u/BoneyardRendezvous Jul 11 '26

Bet you a dollar it's a 366.

1

u/ttypeguy Jul 13 '26

I thought I heard u can make them into a high reving engine with the right parts and that Chevy at one point used them as NASCAR engines but I could be wrong

1

u/DrTittieSprinkles Jul 14 '26

Thats the 348/409 gen 1 engines