Re: Intake manifold question
No the purpose is to route exhaust gases to the bottom of the carb for a better cold start operation. Many people block them off if they want to eliminate heat at the manifold for performance operation but your cold start warm up will suffer in the winter time. To work properly you need a heat riser valve on one exhaust manifold like this one ;;
https://www.summitracing.com/parts/o...SABEgIE2fD_BwE
BTW, you dont happen to have a spare dent/rust free GMC oil pan do you?
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Steve Stock
Gig Harbor, Wa
1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration
1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump
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