Which manifold should I use?

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Sep 18, 2001 | 12:25 PM

Racer-X

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Which manifold should I use?

I have the stock iron manifold #349249GM on my 75. Or I have an aluminum #14057053GMCFM that I've had
laying around my garage for a couple of years because someone told me it came off a Corvette, it looks like it
has all the same connections. Is there anything special about this aluminum one? It has a metal plate (splash
shield) underneath, I think it's to keep the oil from touching and heating the bottom of the manifold. Should I
swap them??

:flag

Sep 18, 2001 | 01:44 PM

79MakoL82

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Re: Which manifold should I use? (Racer-X)

The only info I could find on 14057053 was that it was a manifold used on 350/305's between 78-85 for passenger cars, Camaro's and trucks. The aluminum intake on my L82 is 14007378GMCM. I believe GKULL maintains that the L82 manifold is = Edelbrock Performer. I don't think the aluminum manifold you have is the L82 manifold, so I would say no. I think the only thing you would accomplish is drop some weight and possibly reduce performance.

[Modified by 79MakoL82, 11:45 AM 9/18/2001]

Sep 18, 2001 | 01:59 PM

KenSny

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Re: Which manifold should I use? (Racer-X)

If the aluminum one is for a 305 and you put it on your 350 - you will kill power. Intake runners will be smaller.

Sep 18, 2001 | 02:11 PM

Alwyn678

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Re: Which manifold should I use? (KenSny)

However running an Aluminum Intake might be worth purchasing for your car//// Pick up a performer for very little $$ outlay :cheers:

[Modified by Alwyn678, 1:13 PM 9/18/2001]

Sep 18, 2001 | 02:26 PM

Racer-X

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Re: Which manifold should I use? (Alwyn678)

I believe it originaly came off a 350 Camaro.

Sep 18, 2001 | 03:27 PM

nunus79

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Re: Which manifold should I use? (Racer-X)

Vizard had dyno'd stock manifolds vs. aftermarket. It seemed that below 3000rpm, the stockers made equal or more HP than the aftermarket. Something else to consider.

Sep 18, 2001 | 04:18 PM

gkull

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Re: Which manifold should I use? (79MakoL82)

79MakoL82 years ago i bought the Edel.performer for quadrajet to boost performance I hoped! It looked nearly Identical on all internal dimensions to the 79 L-82. But I put it on anyway and didn't notice a bit of difference. It's a common practice to let GM engineers or others do the research and then copy and market it with subtle changes to not infringe on patent rights. It's the American way. :chevy

Just one of the reasons why I would not recommed any of the low rpm dual planes. It all in marketing.

[Modified by gkull, 3:39 PM 9/18/2001]

Sep 18, 2001 | 04:38 PM

79MakoL82

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Re: Which manifold should I use? (gkull)

gkull: See, I do listen. :D My thinking is that if you're going to swap from a non L82 style manifold to a non L82 manifold, you mine as well go for an RPM or something similar. I was just thinking it probably wouldn't be worth the effort in this case just to shed a few pounds, although I admittedly don't know the exact engines that bore his particular aluminum manifold, it wasn't the Corvette engines. :smash: