Shorty headers
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Summit racing only shows one mfr of shorties for your car - Hedman. Though i'm sure there are others. But Hedman does make good headers - i like'm. And let me say any headers with separate tubes is gonna be better than stock manifolds as the separate tubes can provide some amount of scavenging where cast manifolds can't and create backpressure on adjacent cylinders.
I my book exh tuning is a full science by itself and most cannot afford to fully optimize it - just to much detail and effort. Maybe a sponsored race team with a generous dyno budget but not any hobbyist.
Hope this helped.
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
I know short headers are not great but there are some better ones than the stock ones.I have to keep the cats on my Vette so I'm not expecting a lot,Just better. I have not Seen the Hooker iron one who carry's them?Thanks for the reply's guys.
Team Owner
Joined: Sep 2001
Posts: 62,067
Likes: 1,723
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
I'd generally say that they are not worth the expense unless you live in Commiefornia, but i don't know who makes anything useful anymore either.
If you don't have to pass a visual but must still pass smog then you could put in a better dual system front to back and use new cats, and you will likely still pass smog if the engine is heated up before you go over to the tester.
If you don't have to pass a visual but must still pass smog then you could put in a better dual system front to back and use new cats, and you will likely still pass smog if the engine is heated up before you go over to the tester.
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Race Director
Joined: Nov 2003
Posts: 12,220
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
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Don't know what block you used to build your 400 or what config you "need" for AIR hookup.
That said:
https://www.corvetteforum.com/forums...hlight=headers
That said:
https://www.corvetteforum.com/forums...hlight=headers
Melting Slicks
Joined: Jan 2008
Posts: 2,054
Likes: 120
From: AZ
[QUOTE=856SPEED;1593578999]
I was told headers are optimized for a certain RPM to achieve optimal exhaust pulsing for scavenging (or not) at that RPM. Design considerations include volumetric flow, too. A pal did SEMA testing long ago and actually proved that too-large tubes actually decreased power output because of lost velocity (reduced scavenge).
Shorties, I believe, offer little if any advantage over stockers, as was said in the cost/benefit posts. I had a set of short SLPs, long ago, but sold them before mounting.
I was told headers are optimized for a certain RPM to achieve optimal exhaust pulsing for scavenging (or not) at that RPM. Design considerations include volumetric flow, too. A pal did SEMA testing long ago and actually proved that too-large tubes actually decreased power output because of lost velocity (reduced scavenge).
Shorties, I believe, offer little if any advantage over stockers, as was said in the cost/benefit posts. I had a set of short SLPs, long ago, but sold them before mounting.