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Old 10-03-2013, 04:40 PM
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subzali subzali is offline
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Location: Denver CO
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Not quite sure, maybe this will help?

"Pre '68 F engines used siamesed exhaust ports and a deep "bathtub" style combustion chamber. They're pretty much on their own so far as interchanging anything.

From then until '72 the F engine used a flattop piston and a closed combustion chamber.

'73 and '74 F engines used an open combustion chamber and a very small dome on the piston."
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