416 Headers L92
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More details needed, but on "most" 400-418 cubic inch motor's a quality 1 7/8" is enough header. Even on most 427 setup a 1 7/8" header is a nice fit.
I would do a 1 7/8" with a 3" Y pipe stepped to a 3 1/2" outlet. Should be a very nice combo. Now if you’re going crazy on spray or trying to make HUGE power with LS7 style heads, huge cam etc then that could be a different story. Maybe then you would want a 1 7/8" header with a custom 3 1/2" "Y" pipe to a 4" outlet.
We can get you whatever you need from American Racing, and more than likely have it in stock.
We are having a sale right now on their product. Check it out below.
Thanks
Jeremy
https://ls1tech.com/forums/sponsor-sales-specials/806949-american-racing-headers-halloween-sale-mph.html
I would do a 1 7/8" with a 3" Y pipe stepped to a 3 1/2" outlet. Should be a very nice combo. Now if you’re going crazy on spray or trying to make HUGE power with LS7 style heads, huge cam etc then that could be a different story. Maybe then you would want a 1 7/8" header with a custom 3 1/2" "Y" pipe to a 4" outlet.
We can get you whatever you need from American Racing, and more than likely have it in stock.
We are having a sale right now on their product. Check it out below.
Thanks
Jeremy
https://ls1tech.com/forums/sponsor-sales-specials/806949-american-racing-headers-halloween-sale-mph.html
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More details needed, but on "most" 400-418 cubic inch motor's a quality 1 7/8" is enough header. Even on most 427 setup a 1 7/8" header is a nice fit.
I would do a 1 7/8" with a 3" Y pipe stepped to a 3 1/2" outlet. Should be a very nice combo. Now if you’re going crazy on spray or trying to make HUGE power with LS7 style heads, huge cam etc then that could be a different story. Maybe then you would want a 1 7/8" header with a custom 3 1/2" "Y" pipe to a 4" outlet.
We can get you whatever you need from American Racing, and more than likely have it in stock.
We are having a sale right now on their product. Check it out below.
Thanks
Jeremy
https://ls1tech.com/forums/showthread.php?t=806949
I would do a 1 7/8" with a 3" Y pipe stepped to a 3 1/2" outlet. Should be a very nice combo. Now if you’re going crazy on spray or trying to make HUGE power with LS7 style heads, huge cam etc then that could be a different story. Maybe then you would want a 1 7/8" header with a custom 3 1/2" "Y" pipe to a 4" outlet.
We can get you whatever you need from American Racing, and more than likely have it in stock.
We are having a sale right now on their product. Check it out below.
Thanks
Jeremy
https://ls1tech.com/forums/showthread.php?t=806949
American Racing does have stepped headers. And custom built "Y" pipe's. I don't have any pictures of what your asking for but I will put a call into Nick at ARH to see if he can send me a few.
They do make a 3 1/2" to 4" "Y" pipe and are making one right now for a customer that ordered last week.
They do a custom merge so you don't have that raspy sound, leaks, etc and the product is top notch. The price however is much greater when you get into the 1 7/8" stepped and the custom "Y" pipe's.
If you are making the power to need this kind of header/Y pipe then I believe ARH will be the best system you could choose. The product is unbeatable.
Send me a email @ JZ@mphparts.com and I will do my best to get a few pictures for you and go over cost on these systems.
Thanks
Jeremy
They do make a 3 1/2" to 4" "Y" pipe and are making one right now for a customer that ordered last week.
They do a custom merge so you don't have that raspy sound, leaks, etc and the product is top notch. The price however is much greater when you get into the 1 7/8" stepped and the custom "Y" pipe's.
If you are making the power to need this kind of header/Y pipe then I believe ARH will be the best system you could choose. The product is unbeatable.
Send me a email @ JZ@mphparts.com and I will do my best to get a few pictures for you and go over cost on these systems.
Thanks
Jeremy
You alreay run some real impressive times. What kind of power are you making? What MPH did you run in the 1/4?
I still feel 1 7/8" is a great headers do go with and enough for your NA motor. We have done 3 ported heads/ L92 motor's now and the best power was 551.7... He has 1 3/4" ARH headers, which just goes to show that the combo is working and I doubt the 1 3/4" are holding him back much.
Jeremy
I still feel 1 7/8" is a great headers do go with and enough for your NA motor. We have done 3 ported heads/ L92 motor's now and the best power was 551.7... He has 1 3/4" ARH headers, which just goes to show that the combo is working and I doubt the 1 3/4" are holding him back much.
Jeremy
mine did 505whp when it was a 6 speed and 445 whp with the th400. 124mph with a 1.50 60 foot, iam trying to get my numbers up were they should be iam changing the cam and headers to help i hope, looking to get 470 whp with the th400, when my car was a 6speed it just did not make no were near 551 whp looking for the missing hp
Well I will give you the breakdown of his combo and you can do the math however you believe it works best.
2003 Z06
12:1CR
TEA ported L92's with a L76 intake, and a ported LS2 TB.
250/258 duration cam, 620ish lift on a 113+0
ARH LT's with non catted X pipe, and Borla Exhaust
Ele Water pump, vararam, cometic .045 gaskets.
93 octane. Dynoed on a dynojet 248C with a spec stage 3+ and alunimum flywheel.
He now has a steele flywheel and a heavier rear time and made 533 a few weeks back.
But says it feel's stronger. HAHA go figure.
hate to do this to you as you already have a strong running car but have you considered the 4" bore ETP LS7 heads? You will gain between 15-30 CFM's through the manifold using the LS7 style ETP heads and a ported LS7 intake manifold over what you have now. The manifold is really a killer of power, especially past 6,200 RPM's.
2003 Z06
12:1CR
TEA ported L92's with a L76 intake, and a ported LS2 TB.
250/258 duration cam, 620ish lift on a 113+0
ARH LT's with non catted X pipe, and Borla Exhaust
Ele Water pump, vararam, cometic .045 gaskets.
93 octane. Dynoed on a dynojet 248C with a spec stage 3+ and alunimum flywheel.
He now has a steele flywheel and a heavier rear time and made 533 a few weeks back.
But says it feel's stronger. HAHA go figure.
hate to do this to you as you already have a strong running car but have you considered the 4" bore ETP LS7 heads? You will gain between 15-30 CFM's through the manifold using the LS7 style ETP heads and a ported LS7 intake manifold over what you have now. The manifold is really a killer of power, especially past 6,200 RPM's.
dont want to change heads yet because i want to build another motor next fall using a tall deck lsx block, his cam is all most like my new one from texas speed 251-259 661-663 on a 112 i hope it helps over what i got now, thanks for your help
