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1968 L79 327 manifold question

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Old Oct 15, 2014 | 06:50 PM
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Default 1968 L79 327 manifold question
Was the exhaust manifold on the 327 350hp the same 2 inch one that was on the regular 327 300hp? ...or was it 2.5 inches?

Thanks!
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Old Oct 15, 2014 | 09:48 PM
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I believe the 68's all used 2.5" pipe. Others will chime in.
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Old Oct 15, 2014 | 09:58 PM
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No SBC C3 came with a 2.5" manifold. All were 2" AFAIK. Casting numbers for both SBCs in '68 were 3872765 LH and 3872778 RH.
Last edited by Mike Ward; Oct 16, 2014 at 10:13 AM.
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Old Oct 16, 2014 | 12:44 AM
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Originally Posted by Mike Ward
No C3 came with a 2.5" manifold. All were 2" AFAIK. Casting numbers for both SBCs in '68 were 3872765 LH and 3872778 RH.
I thought that the 427's were though?
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Old Oct 16, 2014 | 10:16 AM
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I corrected my answer.
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Old Oct 16, 2014 | 10:52 AM
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Originally Posted by Mike Ward
I corrected my answer.
Okay, thanks. Is there a 2.5 exhaust manifold that fits the 327? One that looks stock...
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Old Oct 16, 2014 | 11:09 AM
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Some C2 manifolds are 2.5"
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Old Oct 16, 2014 | 11:15 AM
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Originally Posted by Mike Ward
Some C2 manifolds are 2.5"
And they all work I assume? So I could buy a repopped exhaust manifold from Ecklers or Paragon for a 1963 - 1967 327 that is 2.5 inches and bolt it right on then?
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Old Oct 16, 2014 | 11:52 AM
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I have no idea. Do you have an exhaust system with a 2.5" inlet?

I think you're wasting time and money. GM stopped producing 2.5" manifolds for a reason. Even the LT-! didn't use them.
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Old Oct 16, 2014 | 12:18 PM
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Originally Posted by Mike Ward
I have no idea. Do you have an exhaust system with a 2.5" inlet?

I think you're wasting time and money. GM stopped producing 2.5" manifolds for a reason. Even the LT-! didn't use them.
I just figured it was a cost issue for GM. Won't 2.5 inch manifolds open up the back pressure for mor HP? Like headers would...
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Old Oct 16, 2014 | 08:59 PM
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...if you're going to use your stock '68 alternator configuration, be sure any C2 ones you might buy are like the '68. Not sure if any C2 2.5" manifolds had that '68 alternator set-up for the bottom bolt? Maybe '67s did?
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