I have a pontiac 400 0200020 XC under the timing chain cover and 500557 numbers on the block ,would like to find out what exactly it is , I was told it was a ram-air engine, of H.O any help would be great , thank you also 75 is stamped on it by the distrubetor.
-- Edited by Steve_g on Wednesday 1st of July 2015 02:57:41 PM