Bigwebb

I picked up a set of stainless works headers and catted x for my 08 c6 recently off of a forum member. He pulled them from an LS2 C6. He wasn't sure what the size was but he thought they were 1 7/8, so I pulled the trigger. When they came in, and I measured them, they appear to be 1 3/4, although it's hard to tell the difference, as it's only an 1/8 of an inch. Doing a little digging on the internet, it is hard to decipher what stainless works was making those years. Some vendors have them in stock and say they only came in 1 3/4 and 2" sizes for those years, while other vendors say that they have 1 7/8 available for the 05-08 model years.

So I have two questions.... First, are they likely 1 3/4 or 1 7/8? What does the vendor actually offer? Second, what other brands of headers would fit with the stainless works catted x pipe, should I decide to go ahead and buy a set of 1 7/8" headers? The reason I am considering replacing them, is that I am going full head (TFS 255) and cam with lowered compression, and I don't want to have a part on the car that's going to hold me back, after I've spent that much money.

Thanks in advance for any wisdom..


Daniel

Bigwebb

anybody?

Bigwebb

isn't stainless works a vendor on here? maybe they could chime in?

Ahrmike

simplest method: get a flexible but not stretchy cable, wrap it around the primary, and measure it. Divide measurement by pi = your diameter.

AORoads

Not trying to be a dork, but have you tried calling them? Are there any numbers on it?
I'd think the company can tell you where to look if there are any. Here's their website. http://stainlessworks.net/ Really, before I asked most vendors, I'd ask the company that makes them.

Brandon619

Bigwebb

ok I'm about to show how dumb I really am. The diameter refers to outer diameter? If that's the case I'm good to go

Ahrmike

yes, its outside dia but with 16/18 gauge it doesnt really matter if youre measuring the inside or the outside if we're moving in 1/8" increments. I believe most exhaust PIPEs are measured via outside diameter anyway.

The difference between 1-3/4 and 1-7/8 is about 0.4" so as long as whatever you measured with isnt super stretchy, you should be good.

Bigwebb

I measured the diameter of the interior of the hole with a tape measure. If I was measuring the outer diamter, I'm certain it would've been larger than 1 3/4.

you're saying the difference is close to half an inch. Are you referring to outer circumference?



daniel

RHEACERDAVE

3/4 is 6/8 so only 1/8 inch difference. Street/ autocross 1 3/4 will give more torque, 1 7/8 may make more HP at higher RPM.
when deciding, be honest where you need torque. Don't dragrace? Probably don't need 1 7/8. Roll in, you may be making even less power till revs build.

RHEACERDAVE

um.. 3/4 Is 6/8 so it is 6/8 vs 7/8 or 1/8 inch which is 0.125 inches, right? Just measured mine with calipers, 1.746 outer (1 3/4), 1.62 inside.

Bigwebb

perfect. Sounds like I have myself a set of 1 7/8s then

Ahrmike

Yes, i meant circumference. Its usually easier to measure circumference because you dont have good access to the internal dia, but easy access to the outside diameter (but without a caliper its difficult to properly pinch the tube, plus tubes do oval, etc etc).

circumference changes by 3.14x the diameter (cuz of pi) so a 0.125 dia change will be a 0.39" circumference difference.