You probably know this, but if you don't already have FWC, you'll need to add it if you go with aluminum heads, so the weight of the Hex and extra plumbing would offset some of the weight savings of the aluminum heads. One thing I'd check on is the height of the risers on the exhaust manifold because that hull is so deep that the engine is pretty far below the water line. I think Connor said he went to 12" risers on his!
Just curious, how much extra were the sodium filled valves? On the valve seats, I think Stellite, which is around 55-60% cobalt, would be harder and tolerate higher temps than beryllium copper, although the latter probably has better thermal conductivity. Guess I'd research what the go-fast guys use on their engines, as they probably like to run WOT a lot!
|