LT1 vs LT4 Exhaust Manifolds
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Joined: Jan 1999
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From: I reached back like a pimp and smacked that LS1....
Just to make sure everything is clarifiied on this, there really is no such thing as an f-body LT4 exhaust manifold. All LT4 Firehawks & SSs had LT1 f-body exhaust manifolds that were extrude honed, which flow about the same as 96-97 shorty headers. Also, they were not stainless steel.
The exhaust manifolds on my LT4 SS car # 91 were in fact stainless steel.
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Joined: Sep 2003
Posts: 707
From: Dallas
Wierd, guess that's another one of those SLP "let's change something in the middle of a production run" deals. Mine are standard cast iron with heatshields that have been extrude honed. Of course, it's not a big suprise for them to change something like that, similar to them changing the Firehawk hoods mid year in 97 from the original Firehawk hood to the WS6 hood.
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From: EAST COAST USA
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Re: LT1 vs LT4 Exhaust Manifolds
Yes.... LT1 F-Body headers work with LT4 heads. My AS&M mid-lengths bolted up OK to my LT4 heads. From a performance point of view, a 1-3/4” primary is preferable to 1-5/8”, if that's what your shorties are.
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