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heavymech · 05-31-2015, 10:16 AM

Are those headers 1 5/8 or 17/8 primaries? I'm doing something similar in my 67 K20 but I'm putting a magnuson s/c on a LS1 with a 4l80E.

05-31-2015, 10:16 AM	#35
heavymech Registered User Join Date: Nov 2013 Location: Burns Harbor, IN Posts: 46	Re: Grandpas 71 GMC Are those headers 1 5/8 or 17/8 primaries? I'm doing something similar in my 67 K20 but I'm putting a magnuson s/c on a LS1 with a 4l80E.