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The MR-1 Pontiac blocks are
cast from certified high quality cast iron with chemistry verified with
each production run. The block
features many improvements over the stock block. It has Siamese
cylinder walls that allow up to 4.375" bores without grouting the
block. The deck has a 5/8 " nominal thickness for
stability. The lifter galley has a 1" nominal thickness
with the addition of 3 reinforcement ribs. The block also features
3" main bearing saddles (3.25" option is available at no extra
charge) and is capable of making up to 572 cubic inches. This block
accepts all standard Pontiac parts except for the original Pontiac Valley
Pan. Below are links to details of all of the improvements we have
incorporated into our aftermarket Pontiac block.
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©2004 K&M Performance Parts 