Wondering if a pinhole wouldn't be rather difficult to detect with magnafluxing? Cracks show up easily but not sure if there would be a recognizable pattern with a round dot. I farm the magging out so no experience with it.
Way back in my life I worked for a pump manufacturer. Pinholes were a pretty common experience in the castings and these were new pieces so wall thickness wasn't part of the problem. All it takes is a void (glorified little air pocket) close to the finished surface or casting debris. Either of these will lead to an eventual failure but difficult to find beforehand.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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