Clark Thompson wrote:it wasnt only the dome top pistons that slightly upped the HP it was with the combinations of pistons, cam and carburation. I dont beleive it went to 15 engine HP though.
In the book it does mention cam, carb and governor in cub and cub loboys making the increase, it was only talking about piston changes in this part...
Clark Thompson wrote:I am currently building a hopped up C-60. It is bored .060. Has a new after market head that is somewhat different than any IH head with much less CC's. Plus I had .040 shave off the head to gain another 3 CC's less in each combustion chamber. Im using aluminum flat top pistons with total seal rings.. The intake and exhaust ports are bored and poilished along zeneth carb and the manifold to go with it. Maybe by spring Ill have time to get it fired up.
Please tell us how well this does n please show pics of head combustion chamber n where you got it please... Hope whoever ported n polished the exhaust knows that you DON'T polish intake ports as you need some turbulence to keep the atomized fuel suspended in the air and NOT to fall out of suspension and return as liquid fuel as this is not nearly as combustible. Show pics of manifold and modifications to block (ie porting etc.) (is the manifold ported or a custom one ? unsure the way you mentioned it)