Car Forum World

Hello, I have an 65 Impala which has had an engine replaced. None of the numbers on the heads check out as being a GM product, they have a number on the side of the left hand head looking from the front of the car.
It has a K, then another K but horizontal then the numbers 706121.

Anyone know if this is an after market head as there aren't markings under the rocker cover where they could usually be

Well, I do not know either because I tried a fast search myself. You may want to hit something like a Summit catalogue, or call them, and see if thay can match the numbers up. I am sure they are sitting in front of a computer screen and have a program that will just jump directly to the part for whatever number you give them. They may have some ideas to assist you more along, if they do not know themselves.