big block chevy question for med duty trucks - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sweetk30 · 07-15-2019, 08:52 PM

what are these tubes for on the deep side of the factory intake manifold ?

this intake is from a early 80's . the intake off the 88 truck don't have them but the intake was machined for them to index in . both were 366 engines and same part # carb . early intake non-egr later intake has egr .

read a few guys on other forums say ditch the factory dist and carb and use a reg old hei with a vac advance and simple carb like a 600 cfm edelbrock and there running fine for years with better performance .

any input would be great guys thanks .

07-15-2019, 08:52 PM	#1
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	big block chevy question for med duty trucks what are these tubes for on the deep side of the factory intake manifold ? this intake is from a early 80's . the intake off the 88 truck don't have them but the intake was machined for them to index in . both were 366 engines and same part # carb . early intake non-egr later intake has egr . read a few guys on other forums say ditch the factory dist and carb and use a reg old hei with a vac advance and simple carb like a 600 cfm edelbrock and there running fine for years with better performance . any input would be great guys thanks . Attached Images __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



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