Originally Posted by
colins2
i beleve the st170 gasket is thinner than the RS gasket, last one i got one form Ford was over a year ago
Nah i'm pretty sure the ST170 gasket is 4 layer and the standard RS one is just 3 layer.
Iv got a thick Athena on mine, think it could just be the 1.6mm one but il double check later today, seems to be holding 500bhp fine