i have a GAS 172 motor, and it has a bad cam lobe and the other lobes all measure ifferent sizes...can someone te;; me what the size for a new cam lobe? the largest one I have is 1.56 " and it is the one next to front cam gear...the rest are somewhat smaller...I have a broken tappet and that cam lobe is really smaller ...and I found 1 broken tappet...so I also just aquired another similar motor forparts .....not sure what size ..and unless I take the head off I probaly wont know......So I want to know other than pistons and rings , does all the rest of the motors swap between with each other? and how about the sixe of valves in the head? is there diferent heads and valves? So is the only difference then the bore size?...or do they have different cramkshafts ?
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