Aaron.02.Z28

So I've been looking at some 2 inch lt headers for my Camaro but I have concerns with clearance on the bottom, currently I'm running 1 7/8 lt no cats going through an x pipe, it slightly scrapes on tall speed bumps,so would the 2inch give me less clearance?, or would it be the same... I'm also interested in the hp I can gain from the 2inch, I've also read it depends on the motor , my build is a iron 6.0 .30 over, wiseco forged pistons, k1 h beam rods ,stock Crank, tfs 225 heads, tfs 238/242 .595 595, fast 102/102tb,510+whp , is it a good upgrade, or should I get something in between? Any advice is appreciated

99 Black Bird T/A

iTrader: (4)

Seems likely that 2 inch primary headers with 3.5 inch collectors may loose a little ground clearance.

My guess is below 5,000 rpm the 1 7/8 and 2 inch will be similar in hp & tq. Above 5,000 rpm or so the 2 inch will likely to make more power. I've read on a 600 whp LS7 with 1 7/8 headers that 2 inch primary headers often pick up over 10 whp

On a otherwise stock LS3 the 2 inch are said to pick up ~5 whp & ~ 1 wtq. Per the link below.
5th Gen Camaro headers

Your car would probably gain a little more. If your going to add forced induction and shoot for big numbers it might be worth swapping to the 2 inch header. I'd keep the 1 7/8 if staying NA and buy something else for the car. Of course, only you can decide if the cost is worthwhile to switch.

This may be of interest it's a 1 7/8 vs 2 inch discussion for Ls7
https://www.corvetteforum.com/forums...1-7-8-a-2.html

Aaron.02.Z28

Hmm makes sense, I've heard about 1.825 headers or something like that, what do you think about those?

99 Black Bird T/A

iTrader: (4)

What brand of 1 7/8 headers are on your car currently?

Not familiar with 1.825 as a header primary size.

1 3/4 = 1.75
1 7/8 = 1.875

1 33/40 = 1.825 , guessing someone wants exactly in the middle between 1 3/4 & 1 7/8 and went custom or did calculations for exact header size etc

I would definitely keep the current bigger 1 7/8 primary headers before going 1.825 based on the information currently available.

Aaron.02.Z28

​​​​​​​Must have gotten confused thanks for clearing it up, probably will get someone to custom Fab some headers in between 1 7/8 and 2inch, thanks

99 Black Bird T/A

iTrader: (4)

Edit fixed my cellphone typo,

1 33/40 = 1.825


What intake is on the engine?

Would a cam change with more exhaust duration get about the same gain on the top end as different headers?

Aaron.02.Z28

Im running the fast102, I'm sure a cam would, but my headers are"hand me downs" from my brothers ls1, so a cam change is not something I was looking at, but I wanted to buy new ones so I was thinking make it some what of a upgrade rather then getting the same size

99 Black Bird T/A

iTrader: (4)

With that in mind, I suggest calling American Racing Headers & Kook's and ask about the 1 7/8 x 2 inch stepped primary headers with a 3.5 inch collector if you're really set on new headers. They will probably know if that or a true 2 inch would be best for your set up.

Project GatTagO

iTrader: (7)

You don't need 2" headers...I promise...

Andrew

NHRATA01

iTrader: (10)

TSP had a thread about their 2" headers, I was told you'll either have to notch the k-member for clearance or go with an aftermarket tubular K. I'd like to try it at some point as I could probably pick up a decent amount on a big cube motor. Kind of kick myself for not putting in an aftermarket K when I yanked the motor this winter, lol, would've been nice and easy.