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you still need air to go through the cyl heads and out from the sides in a very turbulent fashion.
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And a radiator does what?
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It's not a good idea to run a Merlin, even with transport heads, beyond 600 hours,
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You can't compare a Merlin or TBO's from the 1940's with today's engines. Most Merlin's are modified so that they will be reliable and last some time.
Mike Nixon can give you a quote...
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Improved Engine Life
Engines restored today actually have enhanced service lives due to the application of improved materials and technology.
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http://www.vintagev12s.com/services.htm