Quick question for all you knowledgeable people,,,, I am building a mild 440 for my dart,hoping for 450 horse. ,I have a virgin pair of open chamber 906’s that came with block,that I have to redo ,,,, but know of a set of ported and polished 915’s off a 67,,, stainless 2.14 and 1.8 valves,.HD springs, titanium retainers… which would YOU use… and what would be a fair price for the 915’s ( which were just pulled off a running engine ) thanks in advance
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