411961
#2
SBO exhaust manifolds have numbers, usually single digit.
BBO have letters, usually a single letter.
I say those are for a SBO.
I think it goes all the way to when the 307 Cu. In. engine series started in the 80 s.
BBO have letters, usually a single letter.
I say those are for a SBO.
I think it goes all the way to when the 307 Cu. In. engine series started in the 80 s.
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