The chamber size for a stock 1977 Chevrolet 305 (5.0L) engine in a Monte Carlo varied slightly depending on the casting number of the cylinder head. There wasn't a single, universally consistent chamber volume. You'll find them generally in the range of
64cc to 76cc.
To know the *exact* chamber volume of your specific heads, you need to find the casting number on the head itself and look it up in a parts catalog or online database. Then you can find the specifications for that specific casting.
