3/8 by 3inch grade 8
3/8 bolts with standard SAE threads that are no less than one inch long. these bolts will have a 9/16 head. i recomend GRADE 8 bolts. lesser grade bolts will work but can sheer. i used 1 1/4 inch long bolts on my big block with no issues. oh and there are 6 bolts that go from bell to block
It's TENSILE strength and on metric bolts it is indicated by a number.
Aluminum does not rust.
They are generally made of grade 8, heat treated steel.
I would recommend at least Grade 8, just to make sure.
3/8-16x1 1/4 grade 8
3/8-16x1 1/4 grade 8
Grade 9 bolts are ideal for heavy-duty applications and are also often used in heavy machinery such as bulldozers. Not only are these bolts considerably stronger than they're grade 8 counterparts, but they are also considerably more resistant to corrosive elements as they are made with yellow zinc chromate
They replace the factory body mounting bolts.
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The 6 bolt holes in the back of the block are tapped 3/8-16. Make sure the bolts are long enough to have 1/2" of threads in the block. Minimum grade 5 bolts, grade 8 highly recommended. The tapped holes in the bell housing are usually 1/2-13, but watch for 7/16-14 which occurs in rare occasions.