Four bolt mains

Oldmanmopar said

yes use them, They act like a girdle helping to decrease block flex by holding the sides of the block in the center. I like them better then the mains I used pictured above

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I am measuring the amount of material there actually is where the outboard bolts would go . So i have not decided yet . the machining process you mentioned is a must . Then talk to the machinist also . He´s got good equipment and knowhow. Thank´s for input .