Gene saw a short comment with a question on Jab 3300 and CHT's. At 75+ degrees OAT, My temps are nearly 40 degrees hotter. I'm in Phoenix, and don't get cool cruise temps until OAT is below 70 degrees. I have old cowl, and keep trying fixes to get cooler temps.. My plane is 601XL-B, and I too purchased from builder.
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