Head Bolt Size

[Sed8ed]

Stupid question but I left my helms at my house and I need to go pick up a tapp. What is the bolt size and thread pitch of the head bolts on an ls motor. Pills, you should know this you just bought the bolts.

Note, I live over an hour from the garage I am at now

 

[solblu]

Helms says 11 x 1.5

 

[pills_PMD]

sorry.. i didn't end up having to retap any of my threads so i dont know the pitch size ..

arp's website should have that..

 

[Sed8ed]

No worries, I brought one of the old head bolts with me and checked at the machine shop supplier. I didn't need to retap the holes again, I needed a fluted tapp to clean the rest of the threads.