I'm prepping FailSpree's original block for buildup with the standard upgrades (SB50 carb/intake/reeds, BBK, gears) and was starting to modify the case to maximise the benefit of these upgrades. Cleaned the flashing out of the case induction ports and reprofiled the rearmost port to expose more of the reed cage. Marked the case to match it to the 44mm BBK gasket, but I think I'll hold off on cutting until I get the 48mm BBK. I'd read on of Tjamz's 50mm Elite S build about the zen of maximizing the boost port performance. Upon cracking FailSpree's case, I found the shape of the house to be non-conducive to the boost port mods done by TJamz. I'll refer to the following image for reference:
If you look at the shape of the back wall of the case, it bends in past the vertical plane to follow the crankshaft, then bows back out into an oversized pocket before cutting back in to form a diminutive port. Has anyone bothered to improve the boost port on a Spree? I figure it would be useful on a kitted cylinder in order to help control engine temperature.