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Old 01-25-2020, 11:23 AM   #1
denis4x4
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Default ARP head studs

Picked up an ARP catalog at the GNRS and see that they have a head stud kit for the Model A with polished SS acorn nuts and washers. Part number is 151-4002.
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Old 01-25-2020, 12:02 PM   #2
Jim Brierley
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Default Re: ARP head studs

Does the catalog show the price? ARP are the best but a bit on the expensive side.
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Old 01-25-2020, 09:40 PM   #3
CarlG
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Default Re: ARP head studs

That kit # hasn't hit the on-line catalog yet.
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Old 01-29-2020, 08:01 PM   #4
Chad Marchees
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Default Re: ARP head studs

Weird, I have a saved electronic copy of a 2017 catalog with it in it, and I have been looking at it online in their 2020 catalog for at least the last 2 weeks now. I saw it and pointed it out to a friend of mine.


*edit* I emailed Summit Racing to get pricing on the kit as I don't see it listed anywhere online.

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Old 01-30-2020, 12:26 AM   #5
johnneilson
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Default Re: ARP head studs

Might also try Reds Headers, they carry ARP now also.

http://www.reds-headers.com/html/contact_us.html
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Old 01-30-2020, 11:39 AM   #6
Bob Bidonde
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Default Re: ARP head studs

As the sud stiffness increases, the stress in the block threads increases, and fatigue life is adversely effected. Why do you need studs intended for high performance engines?
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Old 01-30-2020, 11:56 AM   #7
Jim Brierley
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Default Re: ARP head studs

Because I run high performance engines!
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Old 01-30-2020, 08:05 PM   #8
Pete
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Default Re: ARP head studs

Quote:
Originally Posted by Bob Bidonde View Post
As the sud stiffness increases,

> We are not concerned with stud stiffness, we are using them in tension and thread form shear.

the stress in the block threads increases,

> The stress on the block threads will remain the same as long as the torque value is the same and the thread form is the same.

and fatigue life is adversely effected.

Fatigue life of the BLOCK threads is NOT affected by changing the material the stud is made of. That changes ONLY with torque value, thread form and number of cycles the system goes through.

Why do you need studs intended for high performance engines?

>In a STOCK engine, you don't, unless you get ham fisted with the torque wrench.
...
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Old 01-30-2020, 11:30 PM   #9
johnneilson
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Default Re: ARP head studs

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Originally Posted by Pete View Post
...
You would be amazed at how much damage happens when someone thinks they need to torque the head studs to anything higher than 55ft/lbs "to contain high compression heads"
The one that always gets me, mill the head for higher compression and then assemble with two gaskets. Does even more damage.
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Old 01-30-2020, 11:36 PM   #10
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Default Re: ARP head studs

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Originally Posted by Jim Brierley View Post
Because I run high performance engines!
Ya have to admit, that was funny! Well it made me laugh.....
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Old 01-31-2020, 12:51 AM   #11
Pete
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Default Re: ARP head studs

Quote:
Originally Posted by johnneilson View Post
You would be amazed at how much damage happens when someone thinks they need to torque the head studs to anything higher than 55ft/lbs "to contain high compression heads"
The one that always gets me, mill the head for higher compression and then assemble with two gaskets. Does even more damage.
There are applications where more is better and too much is not enough.
I bought a B block with NO cracks once for 10 bucks. It had every head stud either broken off or stripped out of the block. Easy fix for me. No so much for others. I sleeved each hole with a tapered steel plug .750 on the OD.
The head had 2 o-ring grooves and the block had one that sat in the middle of the head ones. The stud spot face surfaces in the head were enlarged for bigger thicker washers. The head was installed with a solid copper gasket .030 thick.
The studs were made from SAE4340M and heat treated to 40RC. The washers were 1.4 inch dia and .250 thick 4340.
The off the shelf hard high nuts were torqued to 100 ft. lb.
This FLATHEAD engine never blew a head gasket and it went on to win the top fuel 4 cylinder class at the national championship drags running 97% nitroethane and 3% stuff.
It would have been nice to have had one of John's 5 main cranks and girdle back then.
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