hello folks . i want to built my engine ...i have head 4x4 138.4mm 90.83 standar bore satandar stroke .i want to fit wrc gasket 0.50 and pistons 8.1 cr what cr i will have finally .somebody can help ? because i dont know the type to give the cr

 

You need to know:
Bore
Stroke
Volume above piston
Deck height
Gasket volume
Cylinder head volume


anything else will just be a guess

Sounds like you are missing head volume, piston volume, and deck height
WRC gasket volume someone on here will no doubt know though

 

what about 138.4 and 0.50 wrc gasket ..about how much cr ? it will be higher ?8.5 or 8.3 ?

 

i want to go for higher cr . i have stronger sleeves ..with 8.1 cr pistons and 0.50 gasket wrc ..you know if i go for higher cr