model 13 headbolt size/length

[70stage1]

was wondering if anyone has the measurement for what size the headbolts are for the model 13 5 horse

i know the thread is 5/16-24, but i dont know the length?
please let me know

 

[CarlsonMotorsports]

There are two different lengths that were used for many years, then racers went to all longer bolts for more cylinder stability as used in the Raptor series. As for specific length, I'd have to take some measurements, but you want as much thread making contact as you can get, or better yet since you are not dealing with rules restrictions, go to head studs.



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[meracer9]

Bolts are 2 15/32" in length. Threads run roughly 1 1/2" from the bottom.

 

[70stage1]

Bolts are 2 15/32" in length. Threads run roughly 1 1/2" from the bottom.

View attachment 31593

thanks!!
ordered a set of arp head bolts and rod bolts so just wanted to make sure i had the correct length

 

[Chuck_Sloggett]

The bolts are 5/16 -18. -- Chuck

 

[flattop1]

^^^ thats true . If 5/16/24 were ordered . They won't work .