Head stud thread ?

[projectPONY]

Wondering if you guys could help me out. I need to replace a head stud and nut on my Performer headed 306. I know I need a 7/16" stud, but Summit lists several thread pitch and count variations and unfortunately I don't have a pitch gauge. Does anyone know what I need?

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[Kart21]

7/16 x 14 size into the block.

My a.r.p studs are 20 on the head side

[projectPONY]

Cool thanks.

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[projectPONY]

Oh damn! Now let's talk length. The ones i have are 5" in length and the shortest summit carries is 5.5". Should it matter?

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[Kart21]

The ones I have are 5 inches with 1 inch length of the threaded section.

[projectPONY]

Yeah that's exactly what mine are. 5" overall and each threaded section is 1"

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[Kart21]

Where is the difference in the summit ones. Are they just longer or are they longer and threaded longer to make up the extra 1/2 inch? If the difference is just the longer length and the treaded section longer ( 1/2 inch) just thread them into the block a little more.

If the overall length is NOT threaded to make up the difference might have a issue.

The nuts might not tighten up on the head if the threads are long enough.