ENGINE CODE PISTON TYPE # OF VALVES Fully CNC Machined ... Piston Precision Machined CNC Ring Grooves ... 23 Big Block Chrysler 24 Small Block Ford 33 Ford Pinto 66 Big Block Ford 43 ... Domestic Not Listed 104 Sport Compact 101 (4 6 Cylinder) ... -Time Engineering Fee UD Machining per Piston Dome UC Machining per Piston Inverted ... and cavities To calculate custom piston pricing, determine the motor type ( ... Chevy, Ford, etc), piston style (flat top, dome, dish, or ... inverted dome), and which custom piston options you require. To order custom ... pistons, please use the Custom Piston Order Form located in the back of this ... catalog, or download one from our website www. ... jepistons.com. Custom pistons do not come with pins, locks or rings. ...