The nicely milled nipples retain the spring but the smooth replacement nipple simply reduces the inner I.D. to a quarter inch with a restriction.
I always thought the spring was compressed flat from coolant pressure flowing through it and restricted flow under higher RPM running. Now I'm going to have to dig out an older style nipple and see if it does expand out of the way with increased temperature.
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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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