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06-15-2024, 09:25 AM
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Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,353
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Re: exhaust manifold port size difference
I'm pretty sure the manifold with the bigger ports is the original to the 76 K20. This other one with the support bars came off a 77 C10 with a 305 but I have no idea if it is original or not. The numbers on it are L1177 346747LH. I just can't figure out if the size difference in intentional or production tolerance.
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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