Its always been 74cc you have never been alowed to run 64cc. The 1.5 is an issue its hard to go back with out buying new heads and 1.6 is pennies more than 1.5 and if your engine builder is charging alot for the valve job then shame on him it will usually save a worn out head going to 1.6 And Ross don't argue with me I have built Championship engines.

The Kawartha/Sunset/Mosport rules never said a CC, they said.

"Cylinder head must be stock for engine being used. No modifications to cylinder head allowed. Double Bump style heads are not allowed. 202 cylinder heads or Vortec V-8 heads are not permitted." - from the Kawartha 2008/9 rules. There is a 64cc casting without double bump marks.

I'm not going to argue a word you said about 1.6 valves. You are correct, and I bet a whole lot of your championship engines had 1.6 valves in them right...

Well Ross it was a unwritten rule at sunset at sunset if they pulled a head it had to be a smogger.Both 1.6 and 1.5 over the years.

Ross it was always talked about at our meetings 74cc and anytime you can run a dished piston and stay at the comp. you want is a good thing.

There is alot to disscuss on Sun one part says 6" ride height and another says 7"

Well Ross it was a unwritten rule at sunset at sunset if they pulled a head it had to be a smogger.

Tell that to Junior and Larry 😉

I find it funny how the outlaw mini class can run dual piston caliper although, the LLM have to stick with the stock GM single piston caliper.