I have 69 Impala that I have been restoring for the last 3 years. It has a 350 in it that isn't the original engine and I would like to know exactly what I have. The head has these numbers cast in it: E 12 70 which I believe it means it was made on May (E) 12, 1970. Is that correct?

It also has these casting numbers: 3927185. Can anyone tell me what these numbers mean, specifically what year, cc volume and any other information about them?

Thanks,
Harv

 

look's like just plane jane stocker head's Not all double hump sbc heads the same? - Twin City Outlaws Forum a little id chart

 

Yeah, just small valve large chamber 70cc, 307 350 heads Nothing terribly special.

Considered a utility head found on base low HP engines.

 

These heads were cast on may 12, 1970. Like you said, the cc volume is 70 cc. Valves are 1.72 intake and 1.50 exhaust.