I bought a 1978 Silverado brand new. It had a 350, 4 bbl carb and ran wonderfully for 27 years. Never stumbled, never idled rough, no problems...except one. Around 30,000 miles it started puffing blue smoke when started. I just lived with it. I had to rebuild it around 130,000 miles. I was disappointed as I had changed the oil every 2000 miles and had expected a much longer rebuild life. I had it rebuilt by Jasper engines and transmissions in Indiana. They pride themselves in using all new valves and seats. Well, in 3,000 miles, it was puffing blue smoke again. HAs anyone ever heard of a problem peculiar to the 1978 variety 350? I want to transplant this engine in my 1965 stepside, but I really wish I could make it stop smoking. IT only has 10,000 miles on it.
