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Author Topic: Head bolts or studs?  (Read 2062 times)

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Offline Biotex

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Head bolts or studs?
« on: January 18, 2014, 08:27:36 PM »
I noticed today that my 1950 flat head has bolts holding down the head to the block. My parts engine has studs with nuts.
What does this tell me about the age of either engine? I'm wondering which method is better also?
1950 CJ3A
1990 Comanche
2006 Rubicon

Offline garage gnome

Re: Head bolts or studs?
« Reply #1 on: January 18, 2014, 09:37:57 PM »
I would use head studs. Can you post pictures of the two heads? All mine use studs. I think the bolts came on early non ribbed head engines.
Nate in Western MA 1953 3A #3268, The Jalopy, '47 2A Wheelin' rig, '49 3A, #37071, unmolested, bone stock named Ted

Offline Mike S

Re: Head bolts or studs?
« Reply #2 on: January 19, 2014, 01:30:45 AM »
AFAIK, all the L134 engines were originally built with studs. Lots of them jet swapped around over the years.
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Offline Biotex

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Re: Head bolts or studs?
« Reply #3 on: January 19, 2014, 07:33:26 AM »
Quote
I would use head studs. Can you post pictures of the two heads? All mine use studs. I think the bolts came on early non ribbed head engines.

1950 CJ3A
1990 Comanche
2006 Rubicon

Offline athawk11

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Re: Head bolts or studs?
« Reply #4 on: January 19, 2014, 12:26:03 PM »
Given the choice, I would use studs and nuts.  When removing a stubborn head, a stud give you two points of release.  The nut may come off just fine.  If it is stuck, the stud may come out of the block.

With a bolt, you only have one point of release before it would break.

Tim
2-1949 CJ3As
1-1946 CJ2A

Offline Lee

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Re: Head bolts or studs?
« Reply #5 on: January 19, 2014, 11:03:03 PM »
I may be wrong, but was told, industrial engines (welder/generator engines, ect.) had bolts, jeep engines had studs. Industrial engines in most cases were governed and in a generator only ran 1800 rpm, less stress I guess. My 2A had bolts and I replaced them with studs/nuts.

Lee ;)
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Offline bretto

Re: Head bolts or studs?
« Reply #6 on: January 20, 2014, 08:33:51 AM »
The use of proper studs will have the proper thread engagement depth in the block.  Those bolts threads could have a shallow grab.