I have done the cut the flange trick also and it worked for me too. I also
a set of locking header bolts, they have a washer with a tang that you bend
over the flat of the nut after torqued to stop the bolt from loosening. This
has been used for decades on aircraft engines. The bottom line is that most
market parts are not really made that well and do not have to pass any form
quality control that OEM parts do.
1959 GMC fleetside
----- Original Message -----
From: Michael and Stephany Zaic
Sent: Saturday, April 28, 2001 12:28 PM
To: Don Simmons; email@example.com; firstname.lastname@example.org
Subject: Re: [oletrucks] Leaking Hedman headers!
I bought a pair of new Hedman headers for the 396 in my 81 GMC Caballero
about 7 years ago. Using a straight edge across the head-mating flange, I
found the flange to be warped by over 1/8 inch across the length, right out
of the box. I cut the flange between each tube so that each one would bolt
up independently. In 7 years and aprox. 70,000 miles, I've replaced the
gaskets only once. It seems to have worked pretty well. You might
consider this as an option.
52 GMC 150
48 GMC 300
81 GMC Caballero
and a few others
> From: Don Simmons <email@example.com>
> To: firstname.lastname@example.org; email@example.com
> Subject: [oletrucks] Leaking Hedman headers!
> Date: Saturday, April 28, 2001 10:52 AM
> I have a 350 in my 62 and bought Hedman headers for it. After getting it
> running and a little time on the engine, the headers leak at the heads
> I've tried doubling up the gaskets which helped a little but they still
> Anyone have any ideas? I guess next I will remove the headers and see if
> grind the flanges down a little but this is ridiculous for brand new
> be this bad right out of the box! On the upside,the 2 1/2 exhaust with
> Flowmaster mufflers sounds excellent!!!! Thanks for any input!
> Don Simmons
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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