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04-24-2018, 02:41 PM | #1 |
Registered User
Join Date: Jun 2011
Location: Bradenton, Fla.
Posts: 1,100
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A "slightly different" exhaust manifold question?
1988 C2500 5.7...... I just replaced both exhaust flange doughnuts, due to a leak. Nuts..... there is still a leak ( it must be near the flange)....
If I replace a stock manifold, & maybe replace both, I want everything to bolt up & fit emissions the same. Is there such thing as a better version of a stock manifold? Maybe flows kind of like a header, or just "massaged" inside the manifold? No headers, unless they fit as stock, considering spark plugs, smog, etc... ( I read the issues of header fitment problems) If not, I'll just do OEM.... But I thought I'd ask you guys first.
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
04-24-2018, 03:26 PM | #2 |
is a fungineer
Join Date: Jan 2009
Location: Bakersfield, CA
Posts: 795
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Re: A "slightly different" exhaust manifold question?
Check out Dorman 674-530 and 674-531. They are a copy of a factory tubular manifold on late '80s trucks and do have ports for AIR injection.
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2003 S10, 2.2 auto- the daily driver, currently with a 2"/2" drop and some minor engine bolt-ons 1978 Impala 2-door, race 350/T350 - the new race car, in progress 1968 Chevy C10 longbed- 3/5 drop, currently undergoing a heart transplant |
04-24-2018, 03:35 PM | #3 |
Registered User
Join Date: Jun 2011
Location: Bradenton, Fla.
Posts: 1,100
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Re: A "slightly different" exhaust manifold question?
Thanks... I'll check it out...
( It is made in China)..... But I'll check!
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
04-24-2018, 07:21 PM | #4 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,692
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Re: A "slightly different" exhaust manifold question?
Might as well run headers....those are the same style steel with flange vs the oem cast iron that doesn't warp.
As for something different- nobody makes one that I'm aware of because if people are going to spend full aftermarket part price for something they want aftermarket performance from it not just slightly more then stock, at least that's how I see it.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
04-25-2018, 11:30 AM | #5 |
Registered User
Join Date: Jun 2011
Location: Bradenton, Fla.
Posts: 1,100
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Re: A "slightly different" exhaust manifold question?
Fixed the exhaust leak..... Loose hose clamp on a rubber hose connecting the AIR INJECTION PIPE, at the lower/rear passenger side, just as it runs around the rear of engine.. .....nice....
I'm leaving everything alone..... time for a new muffler....
__________________
'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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