If your talking about the truck in your sig, DON'T WASTE YOUR TIME. It will continue to crack. I lock n stitched my 53 block, the only fix is a different block. Did you try Cummins for a replacement ? depends on mileage. I'd give this guy a call at the Corp. office at Columbus, Indiania. Ken Scobel 812-377-7365. He got me all the parts and I did the rebuild myself. Just my .02 cents. Thanks Steve B.