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Originally Posted by Rory Christianson
So crank spacers are legal with Bowtie block but not with the larger journal gm block ?
I was thinking at one time of using a 70 era block and a 283 crank , but then thought I could not use a bearing spacer ?
Also do they make a gm performance replacement manifold that is legal ? Or only the gm stock original manifold
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Rory, to the best of my knowledge, there is no legal replacement manifold. I sold the last one I had back in February. They usually bring around $400 to $500. The guy who bought mine is building a stocker.
You can use the spacers in a production block, a Dart block, or a BowTie block. I would not use a production block, as Dwight said, you're money ahead using the better blocks. They last longer, stay fresh longer, and make more power. You spend a lot of money on the blueprinting operations on a production block that are not needed on a race block.