The Ford Barn

Shoebox · 09-23-2024, 12:51 PM

I have ARP cylinder head studs purchased from Red's Headers back when everyone was out of stock of the ARP kits. Red's had purchased in bulk from ARP and packaged their own, that was in 2022. The studs provided are 3.5" and 2.75" for 8ba and Offy heads. To me it seemed the short ones are a bit too short, I wondered if they accidentally gave me the short studs for stock head application. Was going to call Red's but first called ARP and asked the stud lengths in their kit for 8ba/Offy. They told me 2.60 and 3.350, actually a bit shorter than what I have. So I don't know, I attached some pics, tell me what you think. Thanks.

Ronnieroadster · 09-23-2024, 01:33 PM

The short studs may work as long as the top thread on the stud is at the top of the nut. Another factor those thick ARP washers are not needed I always use stainless washers which are thinner that the ARP washer. I always order ARP studs, nuts and stainless washers from Allensfasteners.com on line they sell every item a lot less than anyone else You could order a longer stud from Allen's in any quantity needed.
If you find it comes up a touch short backing the stud out of the block a bit would work as well. The deciding factor is how high a torque you use if its 50 I don't see why what it would not work.
Ronnieroadster

Shoebox · 09-23-2024, 05:03 PM

Quote:

Originally Posted by Ronnieroadster

The short studs may work as long as the top thread on the stud is at the top of the nut. Another factor those thick ARP washers are not needed I always use stainless washers which are thinner that the ARP washer. I always order ARP studs, nuts and stainless washers from Allensfasteners.com on line they sell every item a lot less than anyone else You could order a longer stud from Allen's in any quantity needed.
If you find it comes up a touch short backing the stud out of the block a bit would work as well. The deciding factor is how high a torque you use if its 50 I don't see why what it would not work.
Ronnieroadster

Thanks for the info Ronnie, The nut only makes it about halfway, a thinner washer would help, but not enough, and I feel best when the stud is bottomed out on the deck. I'll contact Allen's tomorrow as they're closed on Mondays. Thanks again.

Bored&Stroked · 09-23-2024, 10:29 PM

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The bottom line is that the Offy heads are thicker towards the bottom than stock heads - so the studs are too short. Also, when you're looking at studs and lengths, you must know the lengths of the coarse, the fine and the total to determine if what they are selling will work. You can't just go with overall length - as two studs of the same overall length can thread into the block different amounts (due to the length of the coarse thread).

09-23-2024, 01:33 PM	#2
Ronnieroadster Senior Member Join Date: Dec 2010 Location: East Coast in CT Posts: 1,697	Re: Another Cyl Stud Concern The short studs may work as long as the top thread on the stud is at the top of the nut. Another factor those thick ARP washers are not needed I always use stainless washers which are thinner that the ARP washer. I always order ARP studs, nuts and stainless washers from Allensfasteners.com on line they sell every item a lot less than anyone else You could order a longer stud from Allen's in any quantity needed. If you find it comes up a touch short backing the stud out of the block a bit would work as well. The deciding factor is how high a torque you use if its 50 I don't see why what it would not work. Ronnieroadster __________________ I use the F word a lot no not that word these words Flathead, Focus and Finish "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 First Ford flathead roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH reset the record in 2024 to 211.830 running to mile four. Top speed 2024 mile five 220.672 exit speed 221.587

09-23-2024, 10:29 PM	#4
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,723	Re: Another Cyl Stud Concern Sponsored Links (Register now to hide all advertisements) The bottom line is that the Offy heads are thicker towards the bottom than stock heads - so the studs are too short. Also, when you're looking at studs and lengths, you must know the lengths of the coarse, the fine and the total to determine if what they are selling will work. You can't just go with overall length - as two studs of the same overall length can thread into the block different amounts (due to the length of the coarse thread).