header bolts

thread size is 3/8"-16

you may want to investigate whether the rest of your bolts are long enough?

if they're not utilizing most of the depth of the hole they'll all be excusing themselves

quote:

Originally posted by 4V & Proud:
thread size is 3/8"-16

you may want to investigate whether the rest of your bolts are long enough?

if they're not utilizing most of the depth of the hole they'll all be excusing themselves

thanks !

The ORIGINAL header bolts on these cars were specially made for Detomaso.

They are SAE 3/8-16 threads but the bolt heads are METRIC!

Of course you can use regular header bolts that are cheap from just about anyone. Mr.Gasket for instance.

The reason I mention this is more than one Pantera owner has wound up stripping the shoulders off of the header bolts trying to get them out because they were using an SAE socket on the heads and NEVER suspected the heads to be metric.

Personally it is one of the strangest things I've ever seen on anything. Weird in fact.

I took a different approach to the Header Bolts. I bought a set of 3/8 x 1 9/16 UNC Studs and equivalent amount of 3/8 tall Brass Nuts (app 1/2" tall) Its took a bit of persuasion to fit the left set of Headers back on but eventually they gave up ;-) (I cheated and made some of the holes a bit oval)

With the Headers on

Ok , thanks... strange UNC bolts with metric heads
Yes, normaly we use brass nuts on exhausts... they never get stuck due heat cycles ....

quote:

The ORIGINAL header bolts on these cars were specially made for Detomaso.
They are SAE 3/8-16 threads but the bolt heads are METRIC!
Of course you can use regular header bolts that are cheap from just about anyone. Mr.Gasket for instance.

Interesting. 2 years ago I purchased a set of stainless Tri-Y headers for my 66 Mustang (289) and they came with cheap Chinese header bolts that had SAE threads and metric heads - discovered that after having my SAE wrench slip, just as you describe!

Putting any exhausts on over studs is very difficult. The most I have ever used were two studs. One front. One rear.

This would hold the header in place while I started all of the other bolts.

Garth: I'm not sure where the original bolts were made but the point was there was no indication that the heads were metric at all.

The factory was also able to get them pretty tight. There must have been locking compound on them?

I've seen people listening to conversations about this and when they hear this part, they start yelling, "ARE YOU KIDDING ME?" Shocking really!

quote:

Originally posted by Belgiumbarry:

Yes, normaly we use brass nuts on exhausts... they never get stuck due heat cycles ....

Buy a can of "Never Seize" and paint it generously on the bolts before screwing them in.

Nothing will ruin your day more than a header bolt that rusts and welds itself into the head.

Picture yourself cutting your headers off and then having to remove the cylinder head to get whats left of the header bolt out.

quote:

Garth: I'm not sure where the original bolts were made but the point was there was no indication that the heads were metric at all.

Doug - Not suggesting the Pantera bolts were made in China; merely telling how I encountered the same thing with some Chinese made header bolts, also with no indication that the heads were metric. A total head scratcher when I discovered this.

I didn't think you were saying that. I have never come across a listing for that bolt anywhere else.
Who would spec something like that to begin with?

never tought that i would start a thread like this for a missing bolt