I just bought a 92 full size chevy truck. It originally had a 4.3 V6 but the previous owner put a V8 in it. He said it's a 350 but I'm not so sure. I've had people tell me to look on the back of the engine for numbers to run. I did find some numbers but the chevy engine codes revieled nothing. I found a website that has all the codes for chevy and it says to look right under the passenger side head on the front of the motor for three numbers. Is that right? Is there any other place to look that would tell me what size motor it is?