hi guys ,i want to try raising the compression my 55 merc its basically the same as a merc 60hp.
i have a couple of ideas ,my first is fitting domed pistons.dose anyone know if anyone makes domed pistons for these motors?
the other idea i have is getting the block barrel bored.if i do this ,this will lower the the ports .if i went this way,i reckon i'd only take a max of .030 off .would this much have a real effect on the port timing?
also i was thinking of getting the pistons fluted to help raise the exhaust and lower the intake ports?
my motor is pretty much stock,it had a hone and a re ring and its done about 50 hrs .it only pumps 115 psi .i'm trying to get around 140+ out of it.
thanks for any help.
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