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06-04-2024, 11:20 PM | #1 |
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Join Date: Oct 2013
Location: Maine
Posts: 2,344
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exhaust manifold port size difference
I am fixing an exhaust manifold on my K20 with a 350. I thought I would compare it to another one I have on hand from a 77 C10 with a 305. It is fairly easy to tell with the naked eye that the ports in my K20 manifold are larger than the 1977 manifold that I have. When I measure them they are about .050-.060" difference height and width. I was always under the impression that they were all the same size. The castings and markings are almost identical. Do you suppose some manifolds have smaller ports, like for a 305 or is it just manufacturing tolerance?
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
06-05-2024, 12:34 PM | #2 |
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Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 2,976
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Re: exhaust manifold port size difference
Thats interesting, can you post a picture comparing the two? I also figured they would be the same for SBC's. If you have the casting numbers I can look those up as well and see if theres anything different between the two.
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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