Cracked Exhaust Manifold and Replacement - The 1947 - Present Chevrolet & GMC Truck Message Board Network

avgjoeracing · 09-18-2010, 01:03 AM

I thought that my cracked ear was causing my exhaust leak and didn't even see the crack in the body of the manifold. Suprisingly not very loud. Curious as to what the "replacement" came off of.

Pics:http://picasaweb.google.com/avgjoera...haustManifold#

What are the 4 bolts at each exhaust port for, EGT's?

Joe

JimKshortstep4x4 · 09-18-2010, 05:29 AM

The four bolts on the replacement manifold are to seal the AIR injection holes.

If I read the numbers on the replacement manifold correctly, the manifold is off of a 69-72 SBC truck engine.

Jim

avgjoeracing · 09-19-2010, 01:29 AM

So were those CA only, certain years? I am under the impression that my truck was all original and I didn't think that emissions stuff was all that prevelant on trucks that far back.

Sammy · 09-19-2010, 01:52 AM

My 69 had them also. A Mo truck. They didn't have to be shipped into Ca. get the smog pump crap. Apparently.

09-18-2010, 01:03 AM	#1
avgjoeracing Registered User Join Date: Nov 2006 Location: Joliet Posts: 12	Cracked Exhaust Manifold and Replacement I thought that my cracked ear was causing my exhaust leak and didn't even see the crack in the body of the manifold. Suprisingly not very loud. Curious as to what the "replacement" came off of. Pics:http://picasaweb.google.com/avgjoera...haustManifold# What are the 4 bolts at each exhaust port for, EGT's? Joe

09-18-2010, 05:29 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Cracked Exhaust Manifold and Replacement The four bolts on the replacement manifold are to seal the AIR injection holes. If I read the numbers on the replacement manifold correctly, the manifold is off of a 69-72 SBC truck engine. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

09-19-2010, 01:29 AM	#3
avgjoeracing Registered User Join Date: Nov 2006 Location: Joliet Posts: 12	Re: Cracked Exhaust Manifold and Replacement So were those CA only, certain years? I am under the impression that my truck was all original and I didn't think that emissions stuff was all that prevelant on trucks that far back. __________________ '71 C10 Custom 350/350

09-19-2010, 01:52 AM	#4
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: Cracked Exhaust Manifold and Replacement My 69 had them also. A Mo truck. They didn't have to be shipped into Ca. get the smog pump crap. Apparently. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"



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