Are these CHP's notched for standard and twisted wedge heads? I assume so given the dual notch. What the compression ratio of that one(given a 64cc head)?
CHP/Probe pistons have valve reliefs for both inline and TW heads in their dished and flattops. If it's a dome, they only have one set of valve reliefs and you have to specify.
TFS "TWISTED WEDGE", HIGH PORT "STREET HEAT", CANFIELD AVENGER
9/9.5:1 COMPRESSION RATIO
ROSS Ford Windsor pistons are suitable for nitrous applications below 250 HP. ROSS stocking pistons are made on the same forgings, are the same material, and include the same quality design features as our custom pistons.
ROSS includes forced pin oilers and double spirolox on all of our stocking pistons. Pistons are balanced to plus or minus 2.5 grams throughout the set. You can buy replacement pistons one at a time as needed. Our valve pockets are designed to handle most camshaft applications. Our skirt design allows the pistons to work properly under intense heat and tremendous side loads without scuffing or splitting the cylinder walls. Most normally aspirated pistons are designed to operate at .004 piston skirt to cylinder wall clearance. All ROSS stocking pistons include aircraft quality pins that are heat treated and end ground to work in full floated or press fit applications.
Ring grooves are 1/16, 1/16, 3/16.
Will work with TFS, High Port, or Canfield Avenger heads due to three valve pocket design.
Pins included are 2.950 lgth. x .150 wall, aircraft quality and are retained by double spirolox or can be press fitted into rods.
302 block height is 8.206.
351 block height is 9.480.
Compression ratio is based on .050 piston to head clearance (with deck and gasket combined).