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Coming up on the first year of ownership of a 1947 Chrysler New Yorker. Very satisfied with this daily driver car. in April I switched to 40 oil from 30 (engine has always only used non-detergent I am told). Engine is running nice and cool - never over 160 degrees (unless excessive idling waiting at a level RR crossing on a hot day then 180). Never any burned oil smoke coming from exhaust but I have started to notice puffs of white smoke coming from the crank exhaust (not the breather the exhaust under the car) - this occurs after I have been driving for some time and I stop at a red light, a moderate but embarrassing billow of white smoke wafts from under the car. I have changed the oil three times since April and it always turns black right after I change it. I was told that the car had a valve job in the not too distant past and oil pressure appears good - always above 40 PSI - 60 when first started- and drops to slightly below 20 when hot weather and idling very slowly. Before I take it in for a compression test which I believe will confirm that the piston rings are worn and require replacement, I want to know what I am getting into. The car is great and very original - big black four door sedan straight 8 - excellent original interior - but I have been down the re-build path before with a '49 Dodge Special Deluxe Club Coup (Canadian) that I had for about twenty years. The machine shops that I dealt with back then were lousy here and outrageously expensive - maybe there are some better ones now- but I want the best at a fair price and I think that means that there is going to be some travel south of the border in my future where there is greater experience and selection. If any of my fellow Canadians or Winnipegers on this site know of a really good shop here then please let me know and accept my apology - it was well over 20 years ago that I am talking about. Otherwise I kindly ask my American cousins if they can recommend a really good shop in Minnesota, the Dakotas, or Wisconsin - or even farther afield. Some idea of the current cost of this operation or any other options would be greatly appreciated too!