How do I tell if my 350 Chevy is a 4 bolt main?

Question

I have a 1974 Chevy 3/4 ton pick-up. It has a 350 four barrel and stick shift trans. Without pulling off the oil pan, how do I tell if it is a 4 bolt main engine?

Answer 1

you can do either 1 or 2 things to be sure. take the numbers on the top of the block behind the drivers side head and run them on mortec.com or pull the pan off. thats it... even the mortec info may tell you --2 or 4 bolt mains... pullig the pan is 100% true everytime