manifolds - Team Camaro Tech
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post #1 of 6 (permalink) Old Jul 10th, 03, 02:05 PM Thread Starter
 
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i am dropping a zz4 crate engine in my 79 z28 . i dont want to use headers. i know the early 2nd gen. camaros used cast manifolds which were rated at 360hp.will these manifolds bolt to the zz4 with the d-port alum. heads. thanks in advance for any info.
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post #2 of 6 (permalink) Old Jul 10th, 03, 02:21 PM
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Al
 
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Yes they will bolt up. The D-ports are quite a bit larger than the openings in the manifold, which causes a fair amount of the manifold to "hang" in the port, and it doesn't leave much room for a good gasket seal. I ran manifolds on my FB 385 for awhile without any problems. Expect to change gaskets every once in a while.


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post #3 of 6 (permalink) Old Jul 11th, 03, 12:01 AM
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if you must use manifolds, how about a set off a 93-97 Z28/Trans AM/Caprice/Impala SS with an LT1? they are sturdy cast iron, and are supposed to flow pretty well. kinda funky looking, but they will give you a perfect port match, and supported over 300 horses from the factory in the ram air Firebirds. ask around at the local exhaust shops to see if they know of anyone that put headers on their LT1 powered car, or look on ebay or in the for sale section of this site.
the sad part is that i used to know of a set from a 95 Z28, but they got thrown away last summer.

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you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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post #4 of 6 (permalink) Old Jul 11th, 03, 03:54 AM
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If the heads and manifolds are both cast iron you do not use a gasket. That is the way GM built them. There are exhaust manifold gaskets included with engine gasket sets but those are realy just for badly warped manifolds. Otherwise you do not use a gasket there. [img]smile.gif[/img]

-Mark.
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post #5 of 6 (permalink) Old Jul 11th, 03, 05:46 AM
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Al
 
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The ZZ4 has aluminum heads. I'd think a gasket would be a good idea with the dis-similar metals and all.


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post #6 of 6 (permalink) Old Jul 12th, 03, 09:41 PM
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That 360hp was with headers & open exhaust. The iron manifolds are very restrictive (outlet is less than 2")
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