Re-Port/Adjust Port Timing for Stroker Crank

[bushwesl]

I picked up a Pro-X 330 cylinder that I would like to have re-ported for mid-top end, and if possible adjust the port timing for a 4mm stroker crankshaft. The cylinder currently has a "full mx" port job (whatever that means), which I've provided some pictures of the current ports, etc. I was hoping that someone could tell if re-porting and adjusting the port timing was even feasibile with this cylinder. Although, I'm sure this is probably the type of thing where you'd have to have it in your hands.

http://i10.tinypic.com/4uea0ix.jpg

http://i18.tinypic.com/4ub2adl.jpg

http://i15.tinypic.com/5z6cbj7.jpg

http://i12.tinypic.com/6fqtl6q.jpg

http://i17.tinypic.com/5xiyts1.jpg

http://i9.tinypic.com/54lpam9.jpg

http://i15.tinypic.com/4zuqlgw.jpg

http://i10.tinypic.com/4l4llpu.jpg

http://i18.tinypic.com/6eym6o6.jpg

http://i9.tinypic.com/4lhebo9.jpg

http://i11.tinypic.com/63wcosz.jpg

http://i18.tinypic.com/4z9p447.jpg

Also, this is a picture of what looks to be a chunk missing between the sleeve and the cylinder... is this a problem?

http://i16.tinypic.com/6ceuayv.jpg

Sorry for ALL the pictures, but I have no idea what to look for when judging something like this, so instead of guessing I took pictures of everthing. Also, I posted the pics in link form due to them being too large, and losing clarity.

[wilkin250r]

I can't tell you the porting just by looking at the pictures.

But most often, a cylinder that is already ported for the stock stroke cannot be "re-ported" for a stroker. The material has been cut too far, it can't be taken back and made smaller.

It's kinda like drilling a hole. You could always drill it out larger, but you can't "re-drill" it to make it smaller.