2 bolt vs. 4 bolt - Pontiac GTO Forum
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post #1 of 2 (permalink) Old 05-18-2005, 02:24 AM Thread Starter
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2 bolt vs. 4 bolt

so my friend and i are having a clash of opinions on this project.
64 GTO with a soon to be 383 in it. (about 450 hp, 500 ft.lbs torque)
should i buy a 350 with a 4 bolt main, or with a 2 bolt main, to build this motor?
opinions please
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post #2 of 2 (permalink) Old 07-06-2005, 01:33 PM
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2-bolt mains hold up with no problem - you'd be hard pressed to rip the maincaps out of the bottom end of a small block. A couple of examples:

I have a 355 that dynos at 434 horse in a bracket car. The bottom end is bone stock (2-bolt), and the engine has over 300 passes on it with 6500 rpm shift points. No problem.

I just finished building a 406 SBC roller motor for a guy. 2-bolt block with some nice rods on a steel crank. The owner is shifting it just under 7K at the track, and the engine is holding up just fine.

Dan Whitmore's 9-second all-steel GTO 455 is a 2-bolt block...
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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