One sae paper for all heads to read and get those grey cells back to work again. It's not the easiest to read, but for the technically orientated minds I think it is very interesting. It's probably 20+ years old.  

It's not from a magazine so I don't have any details on dates and contact info I'm afraid. I did find the paper number however. It's SAE paper no. 700122. So this could just be 1970. SAE stands for society of automotive engineers and I found their website at www.sae.org 

Thanks for posting it, apart from 4 valve roof type chambers, our well known squish type hemi heads rule. 

Cheers,

Marcel <[email protected]>