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Corvette C5 manifolds work for 1981 Silverado 5.3 swap?

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Old Sep 14, 2017 | 12:30 PM
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Default Corvette C5 manifolds work for 1981 Silverado 5.3 swap?


I know my Truck 5.3 manifold won't fit my chassi on the 1981 Silverado. I Thought some narrower manifolds would work so I bought a set of Corvette C5 manifold, now that I went to put them on the 5.3, the truck motor mounts are on the way.

Can I make this Corvette C5 manifold work on my Squarebody or do I need to got for the TBSS or 2010+Camaro manifold?

Thank you

Last edited by A00125896; Sep 14, 2017 at 01:06 PM.
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Old Sep 14, 2017 | 02:03 PM
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Don't those manifolds exit in the center? Not sure the vette manifolds will clear the front crossmember. You might look into some 4th gen f body manifolds. They fit between a narrow frame and exit the rear.
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Old Sep 14, 2017 | 02:31 PM
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The 4th Gen Camaro manifolds flow pretty well too.

Last edited by G Atsma; Sep 14, 2017 at 07:53 PM.
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Old Sep 14, 2017 | 06:25 PM
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Thank you I will have to do that.
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Old Sep 14, 2017 | 08:34 PM
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I test fit CTS-V manifolds on a 6.0L in a 1987 G20 van but ended up picking up a set of Speed Engineering C10 swap shorties. Both fit the narrow frame opening of the older vans. My LS swapping buddy was going to give me the manifolds but the flanges I found on Ebay were more expensive than the shorty headers. The shorties had collectors with 02 sensor bungs already added into them so that saved even more $$$. The only bad thing about the headers is the 4L80E needs two aluminum ears trimmed to clear and those ears help hold the conveter cover. The two lower bolts and the oil pan bolts should still hold it snuggly though.



Last edited by Fast355; Sep 14, 2017 at 08:41 PM.
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Old Sep 14, 2017 | 08:39 PM
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Yeah, the deal on manifolds is to get the pipe stubs w/ flanges and O2 sensor bungs all in one shot.
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Old Sep 14, 2017 | 08:45 PM
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Originally Posted by G Atsma
Yeah, the deal on manifolds is to get the pipe stubs w/ flanges and O2 sensor bungs all in one shot.
Agreed but my buddy had already sold the low mileage cats to someone who needed them on a high mileage car. Since Texas checks for the presence of cats here in Texas on 1984 and newer vehicles even emissions exempt ones I am going to have to buy a pair of Thunderbolt cats.
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Old Sep 15, 2017 | 07:13 AM
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Shoenfeld LT Headers are made to fit and only cost $300. http://www.schoenfeldheaders.com/truck2.html I have them on my 1992 pickup.
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