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+i have a 427 l88 with alum. Heads the# are 3904392 and the block # 3935439 the engine came out of a 67 covette what year is it and year and did they have this combo.???
3904392 - this is the casting number for the 67 2.19/1.88 106cc L-88/L-89 Aluminum Rectangular port.
3935439 - this is the casting number for a 427 block, 2 or 4 bolt mains. Could be a 390/400/430/435hp engine.
What is stamped on the engine pad and what are the casting dates of the block and heads?