i guess im kind of confused.
theres head studs and head bolts.
head studs part #203-4701
head bolt part # 203-3902
theres head studs and head bolts.
head studs part #203-4701
head bolt part # 203-3902
Holes are threaded all the way down (far enough for the ARP's) the last 10>15mm of thread has never seen a bolt so is usually corroded/glooped and this is what the chaser removes, a "chaser" is very different to a Tap as it doesn't remove material, get it wrong with a Tap and you end up with a sloppy hole and no one likes a sloppy holehvyman;1830029 said:Studs are studs and nuts. They provide better clamping force.
Bolts are just bolts. There also easier to install.
Block threads should always be cleaned and chased. For studs you need a bottom tap(dm has them) and you need to make threads for the last 1/4 in or so that is not threaded at the bottom of the holes so the studs can go down as far as possible.