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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.
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! Eeker
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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. Frowner
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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.

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