what is the proper depth, and how do i lower the truck cost effectively? the grass i was running in wasnt high, it was freshly cut. still, it took alot of throttle to get the truck moving in it. once it was moving though, it was really doing well. i still have to get the tune right.

i read about the mod in another thread. id rather not use brass or (or the soft ferules used in compression fittings). ill probably put a piece of stainless steel in the lathe to knock down the o.d. and use a drill for the i.d.

btw, since im going to run it in the grass more than anything, would the larger cooling head help? i know how to tune an engine (i build engines on the side and my day job is rebuilding industrial diesels), so id just like to keep the temps down, but i heard somewhere that the oversize heads dont allow ENOUGH heat to build in the engine.