Wanting to find out what type of bolts were originally used to fasten the headers, hex or socket head?
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...I believe they were Hex Heads.
You can't deliver much torque with a 'Allen' Head tool. In My View. They work but have a Smaller 'Contact' Area.
The Smart choice is A 12 Point Bolt Head, gives you more Angles to wrench on, around the Tubes. If the Box End Wrench is Too Close to the Header tube for clearance, Grind it Thinner. I found there is No room for a Rachet Handle and Socket! Of course, with a Hex Head you can use a Open end wrench, but it will try to Slip!
Depends on YOUR Header Tubes.
Thanks for your reply and recommendation, though was trying to ascertain what was used in the OEM car?
The "original" header bolts were unique to the Pantera. They are similar to what you can buy today from sources like Mr.Gasket as header bolts.
They are hardened hex head 3/8"-16 NC threaded bolts BUT the heads were unique in that they were not 3/8" hex heads, they were m10 metric.
They don't match up length wise to what is currently available either such as 3/4" long or 1" long. I can't tell you the exact length since I no longer have any here, but they may have been metric in length as well? 23mm seems to come to mind but I may be incorrect on that?
More then a few early owners were stumped when trying to remove their original DT supplied headers when the sockets would spin on the heads of the bolts.
I don't know of any current sources of that combination now.
Thanks for the information and sorry for the delayed reply. We had a sneaky very wet snow event in upstate NY. No power, internet for 2 days.
Stuff happens.
There really isn't a lot of point in using the original Pantera header bolts. They really are just somewhat of a curiosity thing?
In fact, there just was not a lot of point for DT to have used them either. No point what so ever in using them originally? They must have been super cheap to buy at the time?
These aren't the stock bolts (of which I think I have a couple sets - PM me if you are interested... Also have NOS original headers in Ford Boxes). but... Here's an article I wrote for POCA newsletter...
Anti-Loosening Header Bolt Modification:
An easy way to keep your header attachment bolts from loosening up is to chuck them up on your lathe, and to machine the bolt heads so as to form an insert that fits into the header bolt hole but retains the flange on the bolt for seating.
Take your 3/8"-16 x 3/4" header bolt, and machine the lower half of the flange down from .550” to .430”. This reduced diameter will slip securely inside your header exhaust mounting hole.
The combination of the installed friction on the head, and additional friction on the newly reduced diameter head inside the header mount hole keeps the bolts snug. See the pictures below.
