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07-15-2014, 02:18 PM
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#1 |
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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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07-15-2014, 04:38 PM
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#2 |
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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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07-18-2014, 10:07 AM
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#3 |
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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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07-18-2014, 02:25 PM
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#4 |
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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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07-18-2014, 03:22 PM
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#5 | |
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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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07-18-2014, 05:46 PM
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#6 | |
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Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: exhaust manifolds w/o air pollution tubes
Quote:
__________________
'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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07-18-2014, 09:22 PM
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#7 |
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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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07-20-2014, 04:27 PM
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#8 |
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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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07-20-2014, 04:29 PM
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#9 |
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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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07-20-2014, 05:24 PM
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#10 |
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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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