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I have a 440 from a 1967 IMP and it has closed chamber heads...Just freshened it up waiting for warmer weather to install it..but it had smaller ex valves than my 906 heads..Can't remember the head numbers !!



Should have 915 heads & the big valves are an easy upgrade....

"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."