What Do the Notations on Wiseco & JE Pistons Mean?

What do the notations on Wiseco and JE pistons mean? For example, when it says "Foot note: 1,W," what does that actually mean?

The various designations are listed in order below:

1 - Most wiseco pistons have offset pins. Pins must be offset same as OEM for quietest operation.

2 - Due to a compression height that may protrude above the deck, it is recommended that a 1,00mm tick head gasket is used.

4 - Utilizes extra deep valve pockets to expand the range of I-Vtec/Vanos with big/high lift cams and milled heads

6 - These pistons have an oil ring groove that is lower than OE. Will not work with sleeves with access hole if the oil ring is not pinned in place

A - Rings need file fitment to the bore

B - Washers included

C - Stroker kit for B25 stroker crank

D - Weight reduction possible

E - With valve pockets unlike K557M series

F - FSR series (Forged side releaf)

FSR (Forged Side Relief) skirts with a forged design have a shorter skirt width and shorter piston pins compared to traditional "full round" style pistons. The narrow skirt helps minimize contact with the cylinder wall, which causes friction / power loss. Shorter piston pins also reduce the overall weight.

G - Only with 2,5 Ltr conrods

H - Based on Volvo rod 23mm Ford OEM 21mm

I - Tuff skirt Coating JE Pistons

J - Mini Tritec engine

K - Compression ratio depends on cylinder head used

L - Pin 20mm - OEM 20,65mm (3/16)

M - Made to order (4pcs minimum)

N - Aluminum cylinders like Alusil, Lokasil, Silitec, DiASil, Mercosil, ALBOND, FRM, MMC, recommended to run sleeved bores / must sleeve block or Nicasil

O - VR6 cylinder sets from stock can be used

P - Piston guided rod required

Q - Oil squirter modification or removal required or use adequate spacers, please make sure to check rod to oil squirter clearance when relocating oil squirter

R - Full round skirt with or without full milled side relief

S - Asymmetrical FSR series

FSR Series = Forged Skirt

FSR (Forged Side Relief) skirts with a forged design have a shorter skirt width and shorter piston pins compared to traditional "full round" style pistons. The narrow skirt helps minimize contact with the cylinder wall, which causes friction / power loss. Shorter piston pins also reduce the overall weight.

T - Accepts Turbo and Nitrous

U - Head is the other way around on the Eclipse vs the later EVO's

V - Accepts Nitrous and E8

W - C/R calculated with OE head gasket

X - C/R calculated with 1,00mm head gasket

Y - 3D Undercrown milling included

Z - Alusil suited

PS - Perfect skirt coating JE Pistons

UL - Ultra series (Lateral Gas Ports, Accumulator Grooves, Skirt Coating, Ceramic Crown Coating, Upgraded Pins)