Building an Evo 4G63 to make more power? Already making more power and your
coolant overflow tank is filling up for no good reason?
The factory head bolts
can begin to stretch with higher cylinder pressures and cause a enough space
between the block and head for combustion to leak out. Not only are you losing
power, you are putting your cooling system and head gasket at risk.
Replacing the stock head bolts with ARP head studs creates a super-strong
connection between the head and the block and will ensure a positive seal of the
head gasket. Using ARP studs not only makes a much more solid connection, they
facilitate easier R&R of the head and can be torqued more accurately. Since no
torsional torque is required turn the entire shaft (as with bolts), there is an
extremely reduced risk of variation in torque from one stud to the next, which
is much better for the aluminum head.
TECH TIP: Head studs should NOT be installed one at a time with
the head on the car. You risk not only warping the cylinder head, but any
oil or coolant that finds its way between the head gasket can ruin the tight
seal that you are attempting to make. Pull the entire head and do it righ the
Fits Mitsubishi Lancer Evolution 8 / 9
Part # 207-4203