FS: Hedman Headers

[OrangeCrush]

Thanks Tomp,

Much appreciated. I've taken the header off about 4 times now. The first couple of times I thought it was the flange gasket. I used high temp silicone for exhaust to put around the gasket but to no avail.

The last time when I took it apart, I noticed a small dark spot seeping out of the collector/exhaust pipe connection. I hadn't used any gasket silicone because it uses the GM o-ring there.

Needless to say, it didn't help.

Yes, I understand how headers tend to allow the valves and injector's noise to sound like it's got a leak. Mine is definitely a small leak and is proven when I step on the gas. Idling is hardly noticeable, stepping on the gas sounds like a singer sewing machine.

One last question if you don't mind. When you say it had a leak on the collector... do you mean where the collector flange was welded to the actual header pipe?

I'll try the stethoscope trick but it's hard since it really needs to be under a load to hear it.

I wonder if I can get TTK (Tim) to hand on to the undercarriage to help me find it?

Thanks for your time,

Mark

[tomp]

OC, not on the flange but where the 4 tubes go into the collector itself.

Probably not leaky at the o-ring or flange but a bad weld job around collector.

You should never need silicone and the oring is reusable unless you damage it taking it out.

Ask exhaust shop if they have the stethoscope and have them put it up on the rack.

Be real careful taking these on & off too many times as the heads are aluminum.

Make sure to clean old gasket off and be careful not to damage metal surface doing so.

Install bolts at about 11 ft lbs, start up engine to operating temp so gasket is pliable. Now tighten bolts in alternating fashion to 18 ft lbs with engine running.

Also note that some headers will make a small leak noise when you first fire up the engine and last about 15 seconds. This should go away quickly after metal gets hot and expands.

[OrangeCrush]

Thanks bud, much appreciated... I'll let you know what happens.

Mark