90mm Forged Flat-Top and Long Billet Rod Combo
Drop-In Kit - No Cutting or Honing Required
This kit can produce significantly more HP more than the stock rod and piston. It uses a special long length rod and custom flat-top piston so that it fits a stock bore in a 420 Predator without any machining or boring.
Includes piston, rod, rings, bearing, and wrist pin.
Piston: 90mm Diamond Forged Flat-Top (choice of compression height) (NR420)
Rod: ARC 4.450 (+.040) Rod (6274)
Bearing: Tri Metal
Rings: 3 Piece Moly (RINGSET-90-076076106)
Wrist pin: HD Tool Steel
*Note: On used blocks, a light hone may be needed for proper ring seat, and bore must be straight. Slight grinding on the crank counterweight or on camshaft may be needed to clear the rod.
This kit is available with either a standard height compression height (.700 from top of pin to top of piston) or .050 shorter (.650). Typically, most OHVs will use the standard height pistons while 420 Hemis use the .050" shorter piston. It is recommended you measure your current piston to aid in selecting the correct kit. The rod is .040 longer, which will reduce piston to deck by that amount. You must have a at least .020 between head and piston.