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I rebuilt my first motor about 9 months ago, and I think that I made a mistake somewhere. When I go to start it smoke blows out from the exhaust, and the engine seems to choke itself(not the carb). Driving it after that under normal throttle, everthing seems fine. But if I punch it the smoke will start to pour out of the exhaust once again. Also under hard acceleration the oil dipstick will pop up about an inch and some oil will spray out of the oil dipstick tube(seems to happen when it shifts from first to second gear).
Thanks for your help
 

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What color is the smoke? The dipstick-popping problem is indicative of excessive crankcase pressure (the next things that will pop are the front and rear main seals). Sounds like your rings haven't seated, and two things are happening - oil is getting past them into the combustion chamber (causing the smoke), and combustion gases are getting past them in the other direction, causing more pressure than the vent system can handle. Smoke at startup usually results from oil coming down the valve guides due either to 1) Worn valve guides, 2) Missing "O"-rings on the second groove of the valves (early engines) or bad or missing valve stem seals (later engines).

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JohnZ
'69 Z28 Fathom Green
 

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Many years ago I built a small block and made a mistake. I had the block's machine work done at the local machine shop and they honed the cylinders with a coarse grit stone designed to seat standard black rings. I think it was about an 80 grit stone. I then installed chrome moly rings. The chrome rings require a much finer Hon. I believe maybe 240 grit or finer. The result was that some of my rings seated properly and some did not. I had 240 lbs. of compression in every cylinder and burned a quart of oil every 40 miles.
 
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