Chris
Where are you located? I live both at the Oregon coast and in Springfield. The Emerald RC boats pond is a great place to test and we can give you a lot of help. Nice crankcase, by the way. I have an old time manual machine shop at the coast. I've been involved with engine development Since Mike Bontoft and I were the first gas boaters to set a record over 100 mph. Mike (and I) still ran the fastest gas boat so far in 2004. I have the NAMBA two lap gas scale record holding boat. The president of our club also has a gas scale boat. We would love to test, tune, and race with you. Look at the Emerald RC Boats page on Facebook. (I'm not a membeer)
Lohring Miller