Header questions
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
Header questions
i did an engine rebuild a time ago, and noticed, on my stock headers, where the 4 tubes are welded together, the weld was torn, i had an exhaust leak, which have driven me crazy since i had the car..
i welded it leakfree, and have driven her about 500 miles, with more than a few hot-cool cycles..
now, i think the noise, -and the leak.-is back
which headers can-should i use?? any suggestions??
Long tube, short tube, which brand, which part number?? i dont want to loose the low end torque!!
thank you!! :cheers:
i welded it leakfree, and have driven her about 500 miles, with more than a few hot-cool cycles..
now, i think the noise, -and the leak.-is back
which headers can-should i use?? any suggestions??
Long tube, short tube, which brand, which part number?? i dont want to loose the low end torque!!
thank you!! :cheers:
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Header questions (corvette90)
You haven't listed what you did to the engine, but odds are, that if you go to a 1 5/8ths" primary tube header you will have a torque gain. The more common and reccommended 1 3/4" headers won't cost you net torque, but they will cost you torque over the smaller tubed set up.
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Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
Re: Header questions (CFI-EFI)
ok,my fault, here are the facts and mods
stock TPI, ported and smoothed, ported heads, CC Xtreme energy cam 206/212@ .050, free flowing exhaust, single mass conversion
i´f i had known, that i can burn chips myself someday, i would have taken a diferent setup... :rolleyes:
now, it runs strong, and i want a good reliable daily "performance car", but i ant to get rid of the annoying click-click-click exhaust leak noise...
thanks
stock TPI, ported and smoothed, ported heads, CC Xtreme energy cam 206/212@ .050, free flowing exhaust, single mass conversion
i´f i had known, that i can burn chips myself someday, i would have taken a diferent setup... :rolleyes:
now, it runs strong, and i want a good reliable daily "performance car", but i ant to get rid of the annoying click-click-click exhaust leak noise...
thanks
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Header questions (corvette90)
With those mods (and a few other simple ones) you can have your L98 at the border of 1 3/4" & 1 5/8" LT headers; my preference is 1 3/4" and they are more common for L98s.
Also, toss the "frisbee" from the front of your engine, install a 160deg F t-stat & fan switch, install a K&N air filter with cut lid and maybe underdrive crank pulley.
For a cheap intake mod to realy help top end breathing try the siamese base. It will cost a little low end torque but nicely improve top end breathing.
If you don't have an AFPR you need one to add more fuel at WOT. This is a nice tuning aid till you get a custom chip burned and it may allow you to use stock injectors.
Also full roller rockers will aid top end breathing; chose the correct ratio for you new cam.
With these mods you L98 will likely pull strongly to 6k RPM or so and still have great low end torque.
Also, toss the "frisbee" from the front of your engine, install a 160deg F t-stat & fan switch, install a K&N air filter with cut lid and maybe underdrive crank pulley.
For a cheap intake mod to realy help top end breathing try the siamese base. It will cost a little low end torque but nicely improve top end breathing.
If you don't have an AFPR you need one to add more fuel at WOT. This is a nice tuning aid till you get a custom chip burned and it may allow you to use stock injectors.
Also full roller rockers will aid top end breathing; chose the correct ratio for you new cam.
With these mods you L98 will likely pull strongly to 6k RPM or so and still have great low end torque.
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
Re: Header questions (65Z01)
oh..forgot a few things, that you mentioned
i installed CC roller tip rocker, 1.52 ratio, have already cut lid and K&N, manual fan switch...what i dont have now is the t-stat, but i think i´ll go the 180deg route
i can burn chips myself, also have a WBo2 so trimming fuel is not a problem
can you tell me, where to get 1 5/8" or 1 3/4" headers?
or should i go with some short tubes??
thank you
i installed CC roller tip rocker, 1.52 ratio, have already cut lid and K&N, manual fan switch...what i dont have now is the t-stat, but i think i´ll go the 180deg route
i can burn chips myself, also have a WBo2 so trimming fuel is not a problem
can you tell me, where to get 1 5/8" or 1 3/4" headers?
or should i go with some short tubes??
thank you
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Header questions (corvette90)
or should i go with some short tubes??
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
Re: Header questions (Nathan Plemons)
or should i go with some short tubes??
No. If emissions are not a problem then long tubes are the only way to fly. Shorties are pretty, but that's about it. They might give you 5 hp which is hardly worth the money.
No. If emissions are not a problem then long tubes are the only way to fly. Shorties are pretty, but that's about it. They might give you 5 hp which is hardly worth the money.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Header questions (65Z01)
With those mods you are nowhere near the limit of the 1 5/8ths" headers. It is a rare 350 engine, indeed, that will be able to better utilize the 1 3/4" headers. Check with Ski-down-it and Corkvette, if you want confirmation. Forget shorty's. Long tubes, only.
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Header questions (corvette90)
Hooker does not. Hedman does. Many of the guys on here really don't like the Hedmans. Some others do. I can't speak for any other brands. It will be worth the research. Good luck, and...
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