I don't remember were I read it but using synthetic oil in a rebuilt flat tappet engine is not advised, because it wont break in correctly due to the synthetic oils excellent lubricating ability. They recommended running conventional oil with ZDDP for the first 1500 miles and at that time convert over if that is what you want to run into the future. I do personally know of a case were a SBC's rings never seated in addition to cam problems due to using a synthetic oil from the beginning. Or that was what the ring & cam manufacturer's claim was.
Herb
1954 DeSoto Firedome Estate Wagon 276 HEMI
1956 Plymouth Belvedere 361 4-Sale
1959 Coronet 326 Poly
1961 Belvedere Custom Suburban Wagon 318 Poly
1961 Dodge Dart Pioneer Wagon 318 Poly
1963 Fury 2D/HT 7.0L
1963 Sport Fury Convertible 361
1970 Chrysler 300 Hurst 440
1979 Dodge Aspen R/T Sport Wagon 360
1999 Durango SLT 5.9L
2008 SRT-8 Magnum 6.1L
St. Louis, MO.
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-------Original Message-------
Date: 3/12/2012 1:31:27 PM
Subject: Re: New motor
Does it have the zddp in it?? Ima have to check and see if he ran conventional during initial start then changed or had synthetic the whole time. Not sure, but Ima find out.
Sent from my iPhone
> Besides Valvoline Racing oil, Royal Purple synthetic is another brand that is commonly found in local parts stores, as opposed to having to order or buy at car shows.
>
> Gary H.
>
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Please address private mail -- mail of interest to only one person -- directly to that person. That is, send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks!
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