I actually like the B block better cause when you bore the case there is more meat due to the larger bolt pattern. I believe you would be able to bore it to 66+ mm to acomodate a uncut 63mm jug. Plus they come stock with a sport cam. We will see I have a customer sending his head from Cyprus for me to port and polish. He had run all his times and speed at several distances before sending head off to me. Since he cannot find anyone to bore the case there he is keeping the bottom end stock for now. TOM
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