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My question is why the different girdle and caps? on supposedly S13, S14 maybe S15?? I saw a S16 with the same caps the one on the bottom and that motor was built in 97-98.
Who cares why they're different. If you bought a complete longblock, then keep all the original parts in it. I can tell you right now, the difference in those cap designs makes absolutely zero difference in power or weight or strength.