383 stroker using oil

Now that is a good suggestion.


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What kind of crankcase ventilation do you use? p.c.v, breathers?What valve covers? do they have GOOD oil seperators?

No one has brougth this up yet, but are you running a 6" rod? is so its because your wrist pin is protduding into the bottom ring land. Its actaully quite common, also why I stray away from short piston compression hts on the street- that and the top ring sees too much heat.

There are differant grades of SYN, oil and some are better and I can tell you this using AMSOIL to break an engine in does not work!!

Compression test does not mean as much as a leak down test at TDC.

We went and looked at a 64 327 vette engine a few weeks ago and the guy said his oil was getting black with is 100 miles on an engine with only 400 miles on it and he had done a compression test and it was between 170 and 200 wish was great but when I did a leak down @ TDC the best cylinder was 10% and the worst was 35% and the rest averaged around 18%

The engine should be hear in the shop to fix the problem and I have a hunch it was not plate honed as I believe a local NAPA shop did the work.

If an engine leaks down more then 8% @TDC it needs a rebuild for sure.

Aside from your mind, do you have any scientific evidence/reports that 0.14/0.13 is not enough?

well no since im not a scientist, why does everyone have to pick everything apart. If you trust it than run it by itself if your like me and like cheap insurance than throw a 10 dollar bottle of zddp additive in. Im not going to sit here and google the **** for ya look it up.

0.14/0.13 of what? Percentage, w/w, w/v, Those #'s don't really say anything. A flat tappet engine needs a minimum of 1200 ppm of zinc and proportionate ppm of phosphourus. Preferrably much higher during break in. GM EOS has over 6000 ppm zinc in a 16 oz bottle, and added to break in oil is a must IMHO. As more and more engines go to a roller follower, and environmental restrictions become tighter, oils will become more critical to flat tappet cam survival. It is my opinion, as a technician, that a half a bottle of EOS per oil change is required with todays off the shelf SM API rated oils.