Plus 1 on Neil's suggestions. I think there is a bit of a restriction at the sideplate as originally designed. As Neil's pic shows, the cast pieces are smoother for more flow than machined. I upsized all my stuff on the side plate too. I also eliminated the Moyer bypass and removed the t-stat so that all cooling goes straight up and thru. It takes it a little longer to warm up when the weather is not hot with no t-stat, but I have a slightly undersized (I think) HX, so I am looking for maximum cooling. I run 165-170°F at 2,000 RPM cruise and 190°F at WOT.
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-Shawn
"Holiday" - '89 Alura 35 #109
"Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
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