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Hello , I was installing my K20a2 head today on my K24 block and it was hard to handtight the headstuds . I had some oil on the bolts but 2 bolts didn't want to go in before it was very difficult. Any know what thread pitch it is ? M12x... ?
 

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1.5 on the motor side--I have ARP studs that are 1.25 on the nut side. Not sure if that's OEM, but for what you are working on at the moment--1.5.
 
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