everytime i try 2 calculate the compression ratio for my motor i get a low number like 8. something. my setup is a b16head,b18abottom,stock rods,ctr pistons,stock OEM gasket,stock crank,i know im doing sumthing wrong.i used the formula cp=TDC vol=cyl vol/TDC vol.for TDC vol i use tdc=head vol+deack vol+piston vol+gasket vol. can somebody tell me what i am possibly doing wrong?thanks