Thanks Scott, I was re-reading your post and compared the TW37b with the SE203.
Am I reding it right that the two cams are pretty similar?
I looked at Wiseco and it looks like their Kit N. VT2764 (forged 3.875 cr 9.5:1 domed) should be the way to go but I wonder if a hotter cam than the two above wouldn't be in order.
Further thought (I hate it when i open the engine upgrade Pandora box!), I should buy new cylinders shouldn't I?

 

Not Scott but although the two cam profiles may look similar, they perform very differently. Look at the lobe centerlines and the LSA. The 37 is better all around cam; the 203 will run out of breath about 4000 rpms. Most people tend to over cam; don't over think this "next step".

No need for new cylinders, use the same OEM pistons your are running or the Wiseco but get .010" OS and hone the OEM cylinders to fit. Sticking with Harley cylinder/pistons is certainly not mandatory but IMHO, a good idea.

 

Our Stage II heads come off the flow bench hover at 150 cfm @ 10", keying on the low and mid-lift numbers, to start the cylinder fill process asap.
Key, to how we are getting those 98"er/37 cam builds to pop those numbers, at 10.0 cr.
Another interesting, often overlooked cam that will bring it, is an S&S .570, at 10.0 cr.
Jim Kennedy of Paradise Perfomance, Matoon, ILL, recently tuned one our 98" engine combo's to 108/115 thru Rhinehart duals, using that cam.
Scott