i have a 91 block already done .030 over that i have no use for 4 bolt main, all you would have to do is notch the bottoms of the cylinders for crank clearance and match the cylinders to the pistons of choice, i spent over 1500 on machine work to this block from align boring the 4 bolt main caps to machining the head surfaces and the actual boring of the cylinders..all work was done by promotion engineering in Hanover off of rt 10...it yours for $500
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2000 T/A WS6: Bolt On's
2007 Honda CBR1000RR Crotch Rocket
1991 RS Convertible - SOLD!
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