I have a pair of BBC Closed Chamber heads, both 3964291. The date codes don't match exactly, yet neverless are bot 4291s. They are rect. port, with 2.19" Intake, and 1.72" Exhaust. I have been told these were availble in limited edition COPO 1969 Chevelles from factory.
Is this correct? If so, does anyone know anyone looking for a pair of these heads?
Thanks
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