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OrrieG · 05-11-2011, 12:44 AM

Go with standard 10w-40 weight oil. I run Dextron II in my TH350 with no problem. Old trick was to run Ford fluid it supposedly tightened up the shift a little but I never noticed any difference. If it is going to see a lot of highway use and higher temperatures you might switch to 20w-50 in the summer. If you are lucky the guy had the valve seats changed when it was rebuilt. If not I would not sweat it, I have ran 283's on unleaded fuel up to 150K miles with no valve problems. Have fun with it, 283 is my favorite engine. Will rev like crazy and nice clean heads visually.

05-11-2011, 12:44 AM	#20
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: Danny Boy is BAACK! w/ '55 Big Window Go with standard 10w-40 weight oil. I run Dextron II in my TH350 with no problem. Old trick was to run Ford fluid it supposedly tightened up the shift a little but I never noticed any difference. If it is going to see a lot of highway use and higher temperatures you might switch to 20w-50 in the summer. If you are lucky the guy had the valve seats changed when it was rebuilt. If not I would not sweat it, I have ran 283's on unleaded fuel up to 150K miles with no valve problems. Have fun with it, 283 is my favorite engine. Will rev like crazy and nice clean heads visually. __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project Last edited by OrrieG; 05-11-2011 at 12:45 AM.