71 pistons

Curious question- on your closed chamber heads you just pulled off.... on the top corner is there a 4 or a 2 there..... and secondly is there a raised bump right next to the number?


Thanks

Yes, there is a 4 with a bump. I compared the heads with a picture of closed chambered, and they are the same. They have the odd shaped chamber with the flat quench area.

Stock pistons for '71s with closed chambered heads were flat tops with big valve reliefs. But after 29 years, some previous owner probably dug around in the engine. Thats why its really wise to do as you are doing and take the thing apart, to see what you've really got, then replace the suspect stuff. FYI, 9:1 compression is about all you should run with a stock cam & pump gas.