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They're referring to the stroke of the crankshaft, all HD TC engines of 96,103, 110 &113 have a 4 3/8 stroke crankshaft, their bore varies from 3.75, 3.875, 4.00, & 4.060 respectively.
...plus you're reusing stock jugs bored...[/quote]Stock jugs bored by a competent machine shop are better than HD BB jugs, they will hold to a tighter tolerance than MOCO.
Tom's stage 3 heads are 1295, and I'm pretty sure wiseco makes his pistons. Wiseco pistons aren't cheap (probably 400-450), throw in a set of cams, gaskets, along with the cost to bore your cylinders, and it can add up pretty fast.
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