im doing a poormans type r build b18c1 block with b16a head and just wantd 2 know what oem honda headgasket 2 use bcuz passwordjdm has them for the b16 at $80 or b18c for $104? is there a differents?im using oem pr3 pistons so are both headgaskets 81mm?

 

Dimensions are the same, number of layers may be different.