Pontiac 400 screw in studs

[ProPower engines]

Hey guys
I am trying to locate a replacement screw in stud to convert some press in studs in a pont. 400.
The stud hole is .434" with the stock press in stud removed making it necessary to install inserts into the heads to reduce the hole to 7/16 X 14 thread.

I don't see anything readily available that uses a 1/2" thread that will work on these heads.

Other then inserts any suggestions on studs

Dave

[wyrmrider]

I've used 1/2 x 7/16 studs but not recently
they should still be available
round up the usual suspects
I don't see them in
ELGIN

[GOSFAST]

Hi Dave, ARP has them for the Pontiac application.

Thanks, Gary in N.Y.

P.S. Part number, 290-7201, should be available?

[ProPower engines]

Hi Dave, ARP has them for the Pontiac application.

Thanks, Gary in N.Y.

P.S. Part number, 290-7201, should be available?

Thanks Gary

I did see something but was unsure if they were applicable to the pontiac head issue.
I will contact ARP and get more details tomorrow.

Dave

[pdq67]

Hi Dave, ARP has them for the Pontiac application.

Thanks, Gary in N.Y.

P.S. Part number, 290-7201, should be available?

Thanks Gary

I did see something but was unsure if they were applicable to the pontiac head issue.
I will contact ARP and get more details tomorrow.

Dave

Are these the studs that had the oil coming through the middle of them to lube the rockers and balls??

pdq67

[tjs44]

Only pre 65 had stud oiling.Tom

[ProPower engines]

Same exact stud design but no center oiling to rockers.
The later heads I have are not drilled for the rocker oiling.

[John Wallace]

Screw in stud

The boss may have to be milled down to account for the hex head of the stud.
(to get the correct height for the rocker ball)

[John Wallace]

From Butler:

Fasteners

[tjs44]

John,later heads that have the guide plates bolted to the heads I believe dont have to be milled.The early heads without guide plates usually do if a shouldered stud.There were studs out there that were screwin but no shoulder that would not require to be milled.I think Isky made them.Tom

[wyrmrider]

Dorman used to have these studs but NLA 370?

[ProPower engines]

Thanks Guys
I found the ARP studs in stock in Ohio.
They are the 1/2 X 7/16 just for these heads.
They are on the way now

Thanks again

Dave C

[SupStk]

As mentioned ARP makes a 7/16 stud with 1/2 bottom. Don't recall having to mill the bosses on '66 up Pontiacs when converting to screw ins.

Pioneer made 3/8" studs without the hex. They had a 7/16 bottom. Number was something like RS-348?