are 1 7/8 headers overkill on mild cam only
04-18-2007, 10:14 PM
#1
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are 1 7/8 headers overkill on mild cam only Hi, i am planning on having an ls6 intake, tsp228r, and headers installed. I found a set of American Racing headers but they are 1 7/8. I know most people get a set of 1 3/4 but in this case i dont have a choice. Do you think i would be alright with these. Thanks
04-19-2007, 03:20 AM
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Originally Posted by Boodyrider
True, and he'll already have them when he does more mods. At worst they will do better everywhere than stock, but give up a bit on the low end compared to 1 3/4.
They may also require grinding clearance into the K member.
They may also require grinding clearance into the K member.
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04-19-2007, 12:04 PM
#8
Originally Posted by Hard Core Z28
1 7/8 are over kill on any 346.
04-19-2007, 01:46 PM
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Originally Posted by ls2formula
People are funny.I just helped a friend put 1 7/8 American racing headers on a stock 2000 camaro with 4" Mufflex.All the car has done is the exhaust a 3200 stall and Lid.The car went 12.4 @ 109 with close to 3800# race weight.
04-19-2007, 02:47 PM
#14
Originally Posted by SSpdDmon
1 7/8 are too big. Tri-Y are best if you can find 'em. Next best is equal length stainless.
If he got a great deal on them then there is no reason to not use them.
04-19-2007, 03:02 PM
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If bigger were always better, then funny cars would be running sewer drains for headers.
Seriously though, there is a point of diminishing returns. Will you see more power over stock manifolds? Of course. Will you see more power with a 1 7/8 inch header over a 1 3/4 inch header on a stock cubed motor? Highly unlikely. I've read about and watched tests performed on engine dynos proving it.
If I were you, I'd either take the headers, try to sell & make a profit on them, and buy something good OR I wouldn't even waste my time and go straight to buying something good.
In the end, it's his car and he can do whatever he wants. No skin off my back. But, you ask for my opinion and I'll gladly give it.
Yahoo!: http://www.crankshaftcoalition.com/wiki/Header_design
AND http://www.superchevy.com/technical/...t/0505phr_exh/
Seriously though, there is a point of diminishing returns. Will you see more power over stock manifolds? Of course. Will you see more power with a 1 7/8 inch header over a 1 3/4 inch header on a stock cubed motor? Highly unlikely. I've read about and watched tests performed on engine dynos proving it.
If I were you, I'd either take the headers, try to sell & make a profit on them, and buy something good OR I wouldn't even waste my time and go straight to buying something good.
In the end, it's his car and he can do whatever he wants. No skin off my back. But, you ask for my opinion and I'll gladly give it.
Yahoo!: http://www.crankshaftcoalition.com/wiki/Header_design
AND http://www.superchevy.com/technical/...t/0505phr_exh/
Last edited by SSpdDmon; 04-19-2007 at 03:17 PM.
04-19-2007, 05:35 PM
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Originally Posted by ls2formula
People are funny.I just helped a friend put 1 7/8 American racing headers on a stock 2000 camaro with 4" Mufflex.All the car has done is the exhaust a 3200 stall and Lid.The car went 12.4 @ 109 with close to 3800# race weight.
A 1 3/4 header will have a better across the board gain which will get you down the track faster. If you never see below 5500 then a larger header might be better.
04-19-2007, 05:45 PM
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Yes. QTP said that they noticed no gain even on a 402. But what do they know? LOL! I'm sure somebody will speak up to show why he knows way more than a header company.
04-19-2007, 06:17 PM
#19
If you have plans for added cubes and/or a power adder down the road...go for it, especially if you're getting a great deal! A little extra gear out back can help you overcome the bit of lower end power you'll lose and you'll have room to grow into them! 
Enjoy.
Enjoy.
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06-27-2007, 09:28 PM
#20
Originally Posted by Hard Core Z28
1 7/8 is to large for a 346. Just because your friend ran 12.4 doesnt mean your right. I know stock manifold cars run 12.2-12.4 and 1 3/4 with the same mods run 11.7-12.1
A 1 3/4 header will have a better across the board gain which will get you down the track faster. If you never see below 5500 then a larger header might be better.
A 1 3/4 header will have a better across the board gain which will get you down the track faster. If you never see below 5500 then a larger header might be better.
