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My father bought a new El Camino in 1968 that had the 307, it was a damn good motor. They were an under square motor, 283 block with a 327 crank which made them quite torquey for a 2 barreled carb engine.
For what it is worth a 307 is an over square engine, 3.875 bore x 3.25 stroke.
a 307 is basically a factory built 283 stroker.
My brothers and I had alot of fun "racing" a built 307 we put in a 62 Chevy II.
A much better engine than the tiny piston, tiny valve and 350 stroke = 305 smog motor
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Yea for sure, I’ve had a few 305’s and never been a fan of a single one of them. Between cracked heads and no torque they arent my favorite. The only one I’ve ever been somewhat satisfied with was a buddy’s vortec 305 in a 97 regular cab short bed, the vortec heads helped it for sure but not enough that I’d want one.
I don’t have any experience with the 307 but I’ve heard decent things about it. I like the 283’s a lot, revving little bastards they are, and the 327’s aren’t much different. There love child can’t be too bad... A de-stroked bigger bore engine like the 302 or 307 is a great combo for high rpms. A small bore longer stroke not so much, especially with weak heads.