1989-1998 Cummins 5.9L Head Stud Kit CA625+ (247-4207)1989 1998 Cummins 5. 9L Head Stud Kit CA625+ (247 4207) The ARP 247 4207 Diesel Custom Age 625+ Head Stud Kit is one of the strongest head stud kits available for your 3. 9L 4BT Diesel powered hot rod. These studs are designed to handle huge amounts of boost or nitrous to make the most power out of your engine. This stud kit features studs that are rated to handle 260,000 psi tensile strength with broached ends for effortless installation. The threads

Re-torqueing the head changes the valve lash setting

4L Powerstroke

the S&S Gen2

or set of compounds

This item is highly recommended for higher horsepower applications

You can expect quicker spool up and elevated boost levels in addition to lowered EGT's

Reverse Safety

This additive can help your engine reach its maximum potential by reducing power and performance robbing deposits hidden within your fuel system

Machined from 300 Maraging AMS 6541 material

The 4" Performance downpipe is backed by a P1 Performance Products 3-year warranty and is built in Canada with heavy-duty aluminized steel - it offers value without compromising on build quality

Whether you're simply servicing your turbos or replacing and upgrading

with the exception of the cylinder head gaskets (sold separately)