Originally Posted by Alex_86
turboboss
they have Compression: 9.0:1
isnt that to high? or is that ok? I am building a zvh my self and they was some cheep pistons
9:0:1 on the 48cc zetec head with the 57cc cvh head you'll end up with a compression ratio of 8:4:1 so you would have to use a 1.2mm de-comp plate or have the chambers cnc machined out.