Nippon Racing JDM P73 Pistons are Heat Treated and come with a Ceramic Hard Anodized Surface Down to the Second Ring Groove to Improve Heat Dissipation as well as use with Nitrous. These Pistons are equipped with 4 Cryogenically heat treated 21MM wrist pis and teflon coated skirts.
ALL NIPPON RACING PISTONS SETS ARE WEIGHT MATCHED TO +/- 1 GRAM. NIPPON RACING PISTONS HAVE DEEPER VALVE POCKETS THAN TRADITIONAL P73 PISTONS TO ALLOW USE OF AFTERMARKET PERFORMANCE CAMSHAFTS UP TO STAGE 3. THESE ARE TRUE HIGH PERFORMANCE RACING PISTONS WITH A HORSEPOWER RATING OF 600 HP.
NEW ADDITION, ROD HOUSING HAS BEEN EXPANDED SO THERE IS NO NEED FOR CUSTOM MILLED RODS WITH THESE PISTONS
THIS KIT IS A PRESS FIT PISTON SET MEANING THEY ARE DESIGNED TO BE USED WITH OEM ORIGINAL HONDA RODS.
COMPRESSION RATIOS ARE AS FOLLOWS:
81MM B18A/B W/PR3 HEAD 11.8:1
81M B18A/B W/P72 HEAD 12:1
81MM B18C W/PR3 HEAD 11.4:1
81MM B18C W/P72 HEAD 11.7:1
ADD .02 FOR EVERY .50MM IN INCREASED DIAMETER