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Re: What are pulley difference SB BB ?
Another easy tell is the exaust ports are evenly spaced on a big block head, while the small block has two real close together in the middle and one on either end.
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1969 Short Stepside
1969 4 WD Suburban
1970 1 Ton Dually....Misfit
oh, and a 2001 HD 2500, 8.1 Allison Shortbed 4 Door
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