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Old 03-09-2013, 01:09 PM
F-4 GUY F-4 GUY is offline
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300 I-6 Rocker Studs

Hi, I am trying to find out when ford changed stud sizes on the 300 I-6. My 77 came with self locking nuts. I need a valve job and I picked up another head which has smaller non-locking nuts and jam nuts. I can't make out the code on the head and am trying to figure out when they changed so I know the year of the head. They both have adjustable rockers and hopefully will interchange. Thanks in advance.
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Old 03-09-2013, 08:30 PM
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According to the Ford parts catalog 73-77 used studs with 3/8"-24 thread. In '78 they switched to the smaller 5/16"-24 thread.
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Old 03-10-2013, 05:27 PM
F-4 GUY F-4 GUY is offline
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Thanks for the quick response. That helps alot.
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Old 03-11-2013, 07:36 PM
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Quote:
Originally Posted by mikeo0o0o0 View Post
According to the Ford parts catalog 73-77 used studs with 3/8"-24 thread. In '78 they switched to the smaller 5/16"-24 thread.
Are the pushrods the same?
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Old 03-11-2013, 07:51 PM
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Quote:
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Are the pushrods the same?
Yup, the catalog shows same pushrods 73-79
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Old 03-11-2013, 07:51 PM
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