AnArKey

I can see myself investing in pulling the head, porting it, putting on 4k intake springs, getting it o-ringed, and installing 12mm ARP head studs. Wondering what kind of power and boost I should limit the motor to if I was to do this?

Trying to decide if I should go that route, or just pull the whole motor out and o-ring the block too, and machine it for 14mm head studs.

Hammer

I have seen Sled Puller win back to back DHRA sled pulling championships with a motor that was o-ringed and had headbolts.That truck is in WVA still used a a puller and has the same motor and never has been apart since it was built some years ago.

I seen F8TLDose and John_P both at or over 800hp with o-rings and fire rings and 12mm studs.John's a daily driver at 891hp and Jason's at 791 which was a puller.Lloyd Mills CR has o-rings and 12mm studs at 1290+ hp.I do not think a 14mm stud is needed unless you are really going to get serious about all out competition,even then I would probably stay 12mm....Andy

thekidfan

If you are that concerned that 12mm "may" not be enough step up to the 625 ARP's they are around $1,000 but thats about the same you'd pay for the standard 14mm studs and the machine work to drill and tap head and block but not counting your time/$$$ to pull the engine.