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Old 05-25-2003, 07:45 AM
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Post 427 Tall deck cyl heads

I am dropping 427 cubes into my 67 Chevelle. I have been told that the stock version of the 427 marine talldeck motor is not the best engine selection due to the heavy pistons this motor uses.Lots of torque but not a quick rev motor.The motor that I have currently has open chamber oval port heads, casting #343772. This combination probably will have a low compression ratio. Can I run closed chamber heads to up the compression ratio? If so, what compression ratio could I expect? Any input on this motor is greatly appreciated!!!
Thanks, Too-tall

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Old 05-25-2003, 09:24 AM
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if your marine engine has flat top pistons,(most tall deck 4-ring) you can easily use early closed chamber heads. if your engine has a domed piston you can only use open chamber head with open chamber piston, either head will work with closed chamber pistons(tho some taller high perf type closed pistons hit the open chamber on the intake relief side, minor grinding cures the problem). As for comp ratio (back in the day) closed chamber heads had 1/8" domed pistons to achieve 10.25-1.
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