Hi all, I thought I would run this by some of you and see what you think. A few weeks ago I changed the heads on my 355 sb with a set of cast 920's that had 202 valves. This thing worked great for about 200 miles and last weekend wile out on a tour it started to smell and bit fumie. It was dark at this time. The next morning I ran it out of the shop and noticed the left exhaust smoking the blues. I have not done a compression test yet, but will in the morning. The thing that bugs me is I was driving the car very easy at the time (I had the wife with me). The motor is nothing special. It has 30 over flat tops, 268H comp cam, stock rockers and comp springs. Total miles on the motor is around 15000. Anything other that a compression test to look at to see if it's the rings or valves ?