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These are Milodon's 4 bolt angled main caps.
Bought these for my block and i drilled the angled holes to deep and ran into the oil galley. Had to go back to the original caps. So i have no need for them any more!!
$115obo
Milodon 11200 - Milodon Main Cap Kits - Overview - SummitRacing.com
Anyone looking for some 4 bolt angled caps
Hoss---because of the extensive machine work to install, align bore and hone ---aftermarket main caps have a very limited audience--we just today bought all that a major Chicago area warehouse had for $60 per set---If yours haven been machined to a block yet , I would offer that to you
Jerry
that is why i do not care to use them on mark 4 bbc they work but you only drill as deep as you need for the bolt and no more . i have four bolt454 bbc engines that i will sell if you need one.from your photo looks like one of your long bolts bottom out in the block as well ?.you could try to sell them on Ebay i am a buyer at $40. for 4 bolt Gm caps you may get more then that if used but that would be my offer