All the ARP kits I've had in the past run the same dia washer as those of stock AAN headbolt. If not lubed up correctly they'll bind the aluminium and twist in on the stud. Seen this happen on stock headbolts too.
Even with the bigger washers on my 12mm studs the head crushes down as the clamping load exceeds the structural density of the head. The only advantage of larger washer diameters is they crush down less allowing for a lower requirement of retorque'ing the head after initial heat cycles.
Even with the bigger washers on my 12mm studs the head crushes down as the clamping load exceeds the structural density of the head. The only advantage of larger washer diameters is they crush down less allowing for a lower requirement of retorque'ing the head after initial heat cycles.
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