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#1 |
Senior Member
![]() Join Date: Aug 2004
Location: Lake Geneva, WI 53147
Posts: 970
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exhaust manifolds w/o air pollution tubes
Is there such an exhaust manifold that did not have the holes for the air pollution tubes that will properly fit a 1985 454 K30? Thanks
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#2 |
Registered User
Join Date: Apr 2012
Location: san diego ca
Posts: 618
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Re: exhaust manifolds w/o air pollution tubes
i just plugged mine
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#3 |
Registered User
Join Date: Apr 2010
Location: Kansas City, MO
Posts: 192
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Re: exhaust manifolds w/o air pollution tubes
YES!
I just replaced mine! I found an old factory set locally with out the smog tube holes. My factory 1983 manifolds had cracks in them anyway. I had a hard time finding the gasket that goes between the manifold and the heat riser (mine is disabled)...but these manifolds bolted right in. I used the longer aftermarket exhaust studs from the picture on the drivers side, and had to make my own studs for the passenger side due to the long length. I even took the time to use a carbide burr to take out the "hump" in the ports of the manifolds. Easier than I thought. |
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#4 |
Senior Member
![]() Join Date: Aug 2004
Location: Lake Geneva, WI 53147
Posts: 970
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Re: exhaust manifolds w/o air pollution tubes
What you have posted is exactly what I need. Can you please post the casting numbers of each. John
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#5 | |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: exhaust manifolds w/o air pollution tubes
Quote:
yes those bumps are disturbing,lol arn't they. i do that to all of them,dosn't make em any quieter lol (did my 350s here)
__________________
John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#6 |
Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: exhaust manifolds w/o air pollution tubes
Hope it wasn't too bad. Mine were all seized in the manifolds. The most disturbing part was how much of the tube extends into the exhaust port of the head.
__________________
'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ![]() I'm kinda like duct tape- no real purpose, but handy to have around. |
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#7 |
Registered User
Join Date: Jul 2011
Location: WV
Posts: 946
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Re: exhaust manifolds w/o air pollution tubes
Did they use those manifolds on the 88-99 trucks?
__________________
72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold ![]() 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD |
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#8 |
Registered User
Join Date: Apr 2010
Location: Kansas City, MO
Posts: 192
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Re: exhaust manifolds w/o air pollution tubes
602AR
396-454 1966-87 Truck, Mtr Home, Passenger Car Casting # 14045176, 353030 1364L 396-454 1970-81 Truck, Mtr Home, Passenger Car Casting # 3994045, 6272279, 343787 |
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#9 |
Registered User
Join Date: Apr 2010
Location: Kansas City, MO
Posts: 192
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Re: exhaust manifolds w/o air pollution tubes
There are various ones to get...there are ebay from time to time.
You can use the 88-91 454 manifolds but they have the O2 sensor hole in them. |
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#10 |
Senior Member
![]() Join Date: Aug 2004
Location: Lake Geneva, WI 53147
Posts: 970
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Re: exhaust manifolds w/o air pollution tubes
Thank you for posting the numbers. John
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