Porting advice

This is a good porting thread.

http://motorbicycling.com/f13/porting-time-get-serious-13396.html

You can clean the ports up but cutting much without knowing would be bad.

A good way to start & practice your skill is to 'match port' the intake & exaust manifolds. Make the transitions between the manifold & cylinder ports flow smooth.
Don't mess with the engine ports until you know what you're doing!

I have the billet intake from Pirate, and reamed it further, and a new NTS speed carb on the way. (The stock gasket covers much of the billet port area so I've cut my own.)

I may have ordered a CNS carb, but according to Spooky, an included two milimeter adaptor is required- that seems like it would cut the porting back down to standard, so they recommend porting the motor- but the intake stays the same, because it's adapted smaller (???)

Anyway, it looks like what is needed is in fact a larger billet to accomodate the larger port fitting on the CNS carb.

I haven't tried anything out yet, so it's just speculation. Could run WORSE for all I know. I've just put the billet on, and am going to test with the same old stock carb, to try each variable independently. Then I'll try the new NTS carb, and it that works better, I'll probably ream the ports on the old carb, just as an improvement.

The ports on the motor are actually larger than the standard intakes already. They match the billet port well on that end. I got my 66 motor last spring, so I'm not sure how standard that is. But to dremel anymore on the motor looks non-productive, unless the intake or billet and carb also have larger ports to accomodate it.