I was looking to order a set of the head studs for my speed masters as well. On the Summit site, the SMs are still out of stock and it says the substitute for the are the ARP 144-4003 where Turbo's link is for the ARP 144-4005. I am not sure what the difference is but the "003" kit costs a bit more. I can't tell anything from the pictures or descriptions between the the two ARP sets. Can you guys confirm which is the correct set?
