I'm assuming here, and that's not good! It was the 318 I had, it was blowing oil everywhere. It was built by lord knows who - with lord knows what! I've heard this a lot on this forum - "I got this old motor and found some good heads and slapped this big cam in it and it runs like a bat out-0- hell ! " well this was one of those motors:) spuwing oil (after resealing), smoking endlessly, but did run like a" bat out -0- hell" til I held third gear through the 1/4 mile:) that's when "all hell broke loose" (or at least the #3 & #4 rod bearings) LOL