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The "#" will be to the left side of the #1 spark plug (or #8 plug).
#4's will have casting #394497 above the center exhaust outlets
#5's all -397742 above the center exhaust outlets
#6's all-403859 " "
#7's all-409147 " "
Check with core suppliers in your area.
Most machine shops know them, but will NOT give that information (or their phone #'s) out to customers.
Anything from a core supplier MUST be fully rebuilt. That means they will need EVERYTHING.
Jim in Phx.
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