Piston Weights and Measurements

I've started this cheat sheet of piston weights and measurements to make engine building a little easier. I know there are many times I would like to know what a set of pistons weigh or measure before I buy them. It helps speed things along and removes guess work.

Due to modern manufacturing these figures should not vary much at all, especially with brand name pistons. The weights given are for a SET of pistons, rings, pins, and clips, like you would need for balancing the crank assembly.

Measurements are the actual measurement of the Piston, NOT the Bore. Bore size would be piston + clearance

Knuckle, Pan & Shovelhead Piston Weights and Measurements

WEIGHT IN GRAMS is total weight of:  2 Pistons, Rings, Wrist Pins, and Clips.

74" STD Bore Size  3.438"

80" STD Bore Size 3.498"

 

Wiseco 74" Forged

recommended clearance .003"

Std  actual measurement 3.4350"  weight in grams - 1105

+.010" -------------

+.020"--------------

+.030"--------------

+.040"-------------

Keith Black 74" Cast, Hypereutectic

recommended clearance .0015"

Std----------------

+.010" actual measurement 3.4450" weight in grams - 1026

+.020"--------------

+.030"--------------

+.040"--------------

+.050"--------------

+.060"--------------

+.070" actual measurement 3.5050"  weight in grams  1079

 

Ironhead Sportster Piston Weights and Measurements

WEIGHT IN GRAMS is total weight of:  2 Pistons, Rings, Wrist Pins, and Clips.

1000cc STD Bore size 3.1880" 1972-1985

Wiseco

STD. --------

+.010" actual measurement 3.1948"   weight in grams

+.020"--------

+.030--------