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National tapered pipe would be the only standard that would be usable with most types of available OEM and aftermarket senders for a product like an aftermarket aluminum head. The acuracy of cutting a good fit NPT is dependent on not only the correct tap but also correctly tapering the bore prior to the tapping process. If the bore was tapered too large the fit will be loose and too small the fit will be too tight. Hopefully the job was done somewhere in the happy medium range at Edelbrock.