Hey I was just wondering what header flanges you guys use on your header builds. I was planing on using regualer SBC circles, will they work? Could I use 1 3/4 or would I need to use 1 5/8?

This will be on LE2 heads.

Jay

 

Most or all of LT1 headers I have seen use round ports. Wouldn't you pick the size based on what size primaries you're using? Or is primary size part of the question?

 

No i was asking about which size bc i heard 1 3/4 ovels wonts work on LT1s. I found a set of 1 3/4 rectrangle and they work (as the headers I have on there now are rectangle.

Jay

 

I am using 1 5/8 round port on my new set up. 76mm t6 turbo

 

i dont know how to put pics on here or id show u mine but i had a set laser cut to match a corvette gasket. ebay used to sell d port flanges for $75.00/set

 

1 3/4" oval are fine as long as the machine shop making the flanges don't mess up and make it too big (like I had happen to me).

 

I digitized my exhaust ports and bolt locations and machined them myself from 1/2 plate for my Twin Turbo setup.

 

Jon, I'd like to see you or one of these other enterprising guys use these flanges so you could make a primary as big as you want and we could still bolt them to the heads.
http://www.stahlheaders.com/af.htm

 

in FI though, you dont really need BIG primary's

 

What I'm really after with the alternative flange is to get the bolts away from the primary tube so you can get a socket on them more easily.

 

on my first turbo kit using some headers i bought from realquick, they had an extension on them to get the bolts out further. However, I could not use regular header bolts, i had to go to the hardware store and buy bolts since they needed to be that much longer. Still worked fine though.

 

how bout these http://cgi.ebay.com/ebaymotors/D-por...spagenameZWD1V

 

Dave, I build all my kits with the assumption that the stage 8 header bolts will be used. These bolts have the allen wrench hole in the center, this way you can use a nice 1/4" drive ratchet and allen head socket. Makes life easier than using a wrench... plus you dont need to fit a socket around the outside of bolt head (where there is no room).

 

I used those initially but getting an allen wrench of the proper length/shortness had been problematic. I now use ARP 12point header bolts and they work well though I still have to use about 3 Stage 8's. How's life Jon!? Hope things are going well.

 

Dave, things are good! Hope those new heads you got will make some power!