Which dmax is the best?

[powerstroke586]

dmax has 18 main bolts and 4 additional 10mm bolt to bridge the vlv train galley per side ~4.5 bolts per bore

iirc 6.4 is is alot closer to 4 then 4.5

IMO holding stock power doesnt really test then head bolts... stock Dmax head bolt usually last till 550-650 mark on big single little more with twins

im runnin the spartan 275 tune have been for a little over 20,000 miles. sorry i forgot to mention that. ive just heard more blown head gaskets on stock trucks than i have on the modded ones. theres quite a few 6.4's makein between 600 and 700 hp with stock head bolts im not sure how long that will last though probably not too long haha