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Figured out what this rotor is...

Snook

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It's a Kelsey Hayes 2 piece - rotor & hub 5x4.5 - been bugging me for a while, see pic

snook

DSC_8140_a.jpg DSC_8144_a.jpg
 
Kelsey Hayes was small bolt pattern. Isn’t that one large bolt pattern?

we also had Bendix for 66-69 B bodies and Budd for C bodies in 4.5 and 5” bolt pattern.
 
It's definitely kelsey hayes. The studs are stamped KH and it's cast into the rotor. 4.5" bolt pattern.

snook
 
Those were also used on the early 1970 E bodies. My November of 1969 built 440/6 Cuda has them.

If I remember correctly, the 2 piece design was prone to warpage due to heat and I believe that the single piece rotors took their place sometime in 1970.
 
Well if they are on my SBird they were on any '70 Road Runner built in November / December 1969. Mine in the milk crate, first time they were turned in 50 years, 56,520 miles.
 
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