1.5" vs 1.75" headers
Thread Starter
Melting Slicks
Joined: Feb 2009
Posts: 2,072
Likes: 1
From: Oklahoma City OK
St. Jude '10
1.5" vs 1.75" headers
I'm hoping to get near the 400 hp mark with ported heads, cam and headers. My question is will 1.5" long tube headers limit my ability to hit that mark or are they good for more?
Thread Starter
Melting Slicks
Joined: Feb 2009
Posts: 2,072
Likes: 1
From: Oklahoma City OK
St. Jude '10
Yeah my bad, I meant 1 5/8 not 1 1/2. So what your saying the 1 5/8 should be ok. RWHP is my goal but if I understand that correctly the crank would need to be around 440 hp or 10% loss on a auto. Is this correct?
Race Director
Joined: Apr 2003
Posts: 17,698
Likes: 1,667
From: moraga ca
1 3/4 will be better. Also in the future when you add more mods to reach 450, you'll be covered.
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Burning Brakes
Joined: Jul 2006
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From: Pittsburgh PA
What size motor? What rpm range you looking to turn and what heads you using?
1 3/4 generally is preferred for that power level. If your using heads with a big exhaust port, get the 1 3/4 since a 1 5/8 wont cover the port. AFR heads are like this... the exhaust port wants/needs a 1 3/4 to properly cover the port.
1 3/4 generally is preferred for that power level. If your using heads with a big exhaust port, get the 1 3/4 since a 1 5/8 wont cover the port. AFR heads are like this... the exhaust port wants/needs a 1 3/4 to properly cover the port.
Thread Starter
Melting Slicks
Joined: Feb 2009
Posts: 2,072
Likes: 1
From: Oklahoma City OK
St. Jude '10
I was looking to get a set of ported heads from cuisinartvette and the headers from SW. The SW headers are 1 5/8 for the non ZR1. It's for an LT1.
I was also looking at Melrose 1 3/4 but couldn't get a quote on just headers and cats, don't need the cat back pipes.
I was also looking at Melrose 1 3/4 but couldn't get a quote on just headers and cats, don't need the cat back pipes.
Last edited by C4fan; Jun 8, 2009 at 05:49 PM.
Race Director
Joined: Nov 2003
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
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Talk to Ron (Cuisinart) and see what he recommends. He's the one doing the porting anyway.
