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Old 08-24-2013, 11:39 AM   #1
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Default ARP head studs- washers and nuts?

I understand the 218-4701 is the ARP part number for head studs for the BP motor, and that they are 7/16" diameter, but I am having a hard time finding much more info on them beyond that (what thread pitch, for example).

http://arpinstructions.com/instructions/218-4701.pdf

Reason I am asking, I need to get just the washers and nuts.... have the studs already from the above mentioned kit. Does anyone know which nuts and washers come with the kit? I screencapped the available options from their catalog below.

I know the nuts are 12-point and I'm pretty sure it's the -20 pitch thread, based on just looking at them. But then the different flange sizes/socket sizes, I have no idea and have had no luck searching the web.

They are closed for the weekend, figured I would ask here in the meantime.
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ARP head studs- washers and nuts?-arp-nuts.png   ARP head studs- washers and nuts?-arp-washers.png  
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Old 08-24-2013, 05:38 PM   #2
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If you still have the stock washers they and should can be re-used instead of the ARP ones. Stock are slightly larger diameter than ARP. The nuts are 7/16" x 20.

Don't follow ARP's instructions and over-torque (80ftlbs) them or you risk damaging the head. Here's a good thread to start with on ARP head torque. I used 60ftlbs, IIRC.
https://www.miataturbo.net/engine-pe...e-miata-54746/
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Old 08-24-2013, 09:03 PM   #3
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Thanks. Turns out I am missing a few other things, so I am going to have to run back my builder's shop anyways. He should have my original ARP nuts and washers.

I just read through that thread again today, a lot of interesting info in there.
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