I just recently bought my 85 Le Sabre. It has a Old's 307 (Y) in it. It did not smoke at all when I first got it. Now it is using 1-2 quart's of oil per day, depending on how much I drive it. It's smoking blue out the exhaust. It's supposed to have 65,000 original miles on it. By the condition of the car I tend to beleive it. My freind say's if the car was sitting, the ring's could be seized up, and now by me driving it, they're starting to cause problem's. Either that or the guy is lieing about the mile's and he doctored the engine up to sell it. So anyway. I did a comression test on one side and got these #'s. 1=70 3=80 5=90 7=74 My freind say's I should have 175, and no less than 125. But, he's use to Chevy motor's. Is this normal, or is it time for a rebuild. Thank's for any input. Cal
My hooptie wagon (86 Buick w/307) was burning a similar amount of oil. It was claimed to have 72,000 when I bought it, but I think it was 172K- but it did still have the original nylon toothed cam-gear. I did a compression check, and got #s in the 145+ range, except 2 under 100 . They didn't increase much when I squirted a little oil in the cylinder and re-checked. I figured it was probably valves and seals, and pulled the heads. They looked pretty bad. The cylinder walls looked decent, for what that's worth. Engine's going back together this week, I'm just waiting on a cam to arrive. You might have a similar problem - see if you can get a leak-down test done.
it's time for a rebuild... -i'd say no less than 140 .. -and around 185 for a snappy engine.. -mine has 200, -but a bit high on compression (11.3)..
Try new valve stem seals. I replaced mine at 90 plus thousand and they were all cracked and crumbling. There the hard nylon type of seal, not rubber. Mark
