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I am just completing a cooling baffle for my 601. This design is by Bob Gutteridge. He is an EAA Tech Advisor who built a Jabiru aircraft with the 3300 engine. He had continuing problems with cylinder head heating problems and designed this baffling system. I copied his desing and adapted for the Zodiac. I should have this finished this week and will report on my temps. On my first flight I had cylinder head temps right near 400 degrees with the older Jabiru fiberglass system.