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I plan on road racing this engine. My last one held up very well aside from a few overheats, it was reliable. Upon dis-assembly this past month I have yet to find any adverse ware on the cams, valve springs, seats or valves. Piston and cylinder suffered some scoring from the overheat, the cylinder is still usable but the pistons are toast. The overheat was caused by the right angle pipe going into the water pump, it cracked around the weld on the pipe. This is the second time this has happened and will be addressed in the new build. The 300 head i will use is going to get ported and the combustion chamber polished. I think I will use the stock valves for the time being and count on super high port velocity to make power. Stock cams will be retained as well but I will degree them for maximum efficiency. To take advantage of the added CC's and port work I will run FCR carbs.I only need to find 6.75 HP. As far as durability is concerned I have already upgraded my clutch and the engine I borrowed the pistons and con rods from makes 30HP per cylinder reliably.
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