Re: 69 Yenko/COPO Rect. Port BBC Heads
You will need to post the date codes to help determine the application, but these were primarily used on 1970 396-375 HP (L-78) and 454-450 hp (LS-6)engines. It appears a few of the #291's were used on '69 L-78's and L-72's. If you would like to sell then best to post the info in the "Parts for Sale" section for maximum exposure.
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