Thread: Is it 305 or 350 How do you tell

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I'd pick up anything with a 4 barrel carburetor that looks stock. I don't think GM put a 4 barrel on a 305 or 307. Otherwise, the casting number on the back of the block will tell you. It's drivers side on the top where the transmission bolts up.

Well, I went back and looked at your post and you're looking for a 1986 or newer engine? That makes things a little more difficult. Get a list of 350 casting numbers and get an engine that matches.

Here are some numbers to look for:
10051184 350 86-up Car & Truck 2 & 4-bolt Passenger stick 1-piece seal
10054727 350 86-up 155-205 Car & Truck 2-bolt Passenger stick 1-piece seal
10066036 350 86-up 205 Car & Truck 2 & 4-bolt Passenger stick 1-piece seal
14011148 350 87-89 2 & 4-Bolt Roller cam one piece seal
14079287 350 86-90 2-bolt Passenger stick one piece seal
14088526 350 87-89 2-bolt Roller cam Passenger stick 1-piece seal
14088548 350 86-88 155-195 2-bolt Truck Passenger stick 1-piece seal
14093638 350 87-95 155-255 Car & Truck 2 & 4-bolt Passenger stick 1-piece seal
14101148 350 86-up 2 & 4-Bolt Passenger stick 1-Piece seal Roller cam
14316379 350 68-88 155-255 Car & Truck 2-bolt Passenger stick 1-piece seal