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Author Topic: Head bolt thread size  (Read 3201 times)

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Offline r4pinto

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Head bolt thread size
« on: January 30, 2013, 07:42:56 AM »
Hey guys
 
On my 1980 Pinto I'm wanting to clean the threads of the head bolts, as well as the threads in the block but I can't seem to find what size tap I need to use. They are the 12 point head bolts.
 
Thanks for any help!
 
Matt Manter
1977 Pinto sedan- Named Harold II after the first Pinto(Harold) owned by my mom. R.I.P mom- 1980 parts provider & money machine for anything that won't fit the 80
1980 Pinto Runabout- work in progress

Offline r4pinto

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Re: Head bolt thread size
« Reply #1 on: January 30, 2013, 11:22:03 AM »
Think I found it... Sounds like it's 12 x 1.75 which didn't seem to thread. We'll see.
Matt Manter
1977 Pinto sedan- Named Harold II after the first Pinto(Harold) owned by my mom. R.I.P mom- 1980 parts provider & money machine for anything that won't fit the 80
1980 Pinto Runabout- work in progress

Offline jeremysdad

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Re: Head bolt thread size
« Reply #2 on: January 30, 2013, 03:44:49 PM »
Sometimes they can be hard to get started. I just had that issue with a 3/8-24 bolt/threaded hole for my rag joint. Brand new bolt, didn't feel like it wanted to go. Don't forget to use a lubricating oil of some type, it can make all the difference.

Offline 72pair

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Re: Head bolt thread size
« Reply #3 on: January 30, 2013, 06:39:33 PM »
See if you can find a thread chaser instead of a tap. Lessens the possibility of removing part of the original thread.
72 sedan 2.0, c-4 beater now hot 2.0, 4-speed
72 sedan 2.3, t-5, 8" running project
80 Bobcat hatchback 2.3, 4-spd, 97K