The block I have is 2 bolt main and not drilled for 4 bolt, I remember years ago when I was using studded 2 bolt mains I cracked the block where one of the studs screwed in. Forgot which main but it was in the middle. Alot of people said is was from using a 2-step and trans brake with solid motor mounts. I since put a mid plate and motor plate in.
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