This is a pair of 3919840 BBC Rectangular Port Heads. They are dated L.21.7 & B.28.8
They came off my car. I am going to open chamber heads and do not need them anymore. They will need to be gone through.
They have not been ported.
It appears that they may have been shaved.
Feel free to call or email me for any questions or pictures.
Thanks SYC, Kurt