All our blocks now come with 4340 Billet main bearing caps STD.
5/8-9/16 primary main studs w/ blind-tapped, rolled threads machined into block.
4 x 1/2 in cross bolts per cap on #2, #3, #4.
Large 0.250 in radii on main bearing bulkheads by design.

caps2.JPGIMG_0403 (002)(no5 cap)(web).jpgIMG_0417 (002)(caps)(web).jpg

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Darren Beale
Keith Black Racing Engines®