Just depends on which end you look at. One way is 135° and the other is 45°. The 135° is the correct definition for the spark plug boot, but it also happens to be 45° from a straight boot.
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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 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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