71 Chevelle ZZ502 Headers Needed !! - Chevelle Tech
Headers and Exhaust Discussion related to Exhaust systems and headers.

  • 1 Post By Ericnova72
  • 1 Post By sz0k30
  • 1 Post By The Geologist
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post #1 of 4 (permalink) Old Jun 5th, 20, 11:06 AM Thread Starter
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71 Chevelle ZZ502 Headers Needed !!

I need help, I've already returned two set of headers that wouldn't fit. Are there any recommendations for a header that will work on a 71 Chevelle that is lowered, with a ZZ502 motor, that will NOT break the bank. The ZZ502 has the "D" exhaust ports, (1 7/8" wide & 1 1/2" tall) will a round header flange work on a "D" port head ??
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post #2 of 4 (permalink) Old Jun 6th, 20, 6:06 PM
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Location: southwest lower Michigan
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Re: 71 Chevelle ZZ502 Headers Needed !!

Yes, round square or oval will work on the D-port head. The thing to look for is not blocking the sides or the top of the port.
Entire port opening in the header being big enough to not block any of the D-port head opening....then it doesn't matter what shape the header port opening is.

Best would be an oval or round big enough that the bottom of the header port opening is below the D-port opening in the head, making a reversion dam along the bottom of the port to block backflow into the cylinder during the overlap period around TDC exhaust stroke when both valves are open..
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post #3 of 4 (permalink) Old Jun 7th, 20, 9:58 AM
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Re: 71 Chevelle ZZ502 Headers Needed !!

ZZ502 crate engines have been around almost 20 years. Pretty much any BBC headers will fit. The problem I see is not The headers fitting the heads, but the headers sitting too low to the ground with the lowered chassis.
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post #4 of 4 (permalink) Old Jun 29th, 20, 12:45 PM
Join Date: Nov 2019
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Re: 71 Chevelle ZZ502 Headers Needed !!

Call Sanderson Headers and tell them what you need (650) 583-6617 https://www.sandersonheaders.com/ If they don't have what you need in stock they could probably make a set for you.
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