Question about header-to-y-pipe gaskets on hedman shorties - Third Generation F-Body Message Boards

clemsparks · 07-30-2009, 03:11 PM

Hi,

I bought a set of used hedman headers with y-pipe.

Can someone confirm if the correct gasket to use between the header and y-pipe is a flat 3 bolt flange gasket?

I tried using a doughnut type gasket and I think this was a mistake. I assumed they were made for the doughnut style...but the flanges are now warped. I need to get this figured out.

Thanks for any help!
Clem

5speed · 07-30-2009, 04:55 PM

I just installed a set on my 86 IROC and there is no gasket between the collector and y pipe..that is provided your collector / y pipe is the "ball & socket" style.

clemsparks · 07-31-2009, 10:27 AM

Mine are an older set with a 3-bolt, 3-inch flange. (not the current style ball-socket. I WISH I had that style!)

Can anyone with an older set of Hedmans confirm which type of gasket they use?

Thanks,
Clem

5speed · 08-02-2009, 12:04 PM

I'd be willing to bet it takes the flat style gasket then.

1bdbrd · 08-02-2009, 02:05 PM

Mine aren't all that old (4-5 years at most) and have a 3 bolt flat flange I believe.

88 TA GTA · 01-21-2010, 01:27 AM

Quote:

Originally Posted by clemsparks

Mine are an older set with a 3-bolt, 3-inch flange. (not the current style ball-socket. I WISH I had that style!)

Can anyone with an older set of Hedmans confirm which type of gasket they use?

Thanks,
Clem

Mr Gasket Ultra Seal # 5971: 3" collector diameter, 3-7/8" bolt circle diameter, 3/8" bolt hole. bolt length 1.5 inches. Just replaced mine, previous mechanic had most bolts in not-reachable positions. even with a open/box end wrench. Ended up bending the flanges so they don't seal well. Make sure the flanges are straight or level all the way around...