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  #46 (permalink)  
Old 04-21-2013, 08:45 PM
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most likely shouldn't use synthetic before the engine is broken in. usually takes 500 miles or so to fully break in a motor. I've built a few and none have ever smoked, ever. usual culprits are valve seals, improper ring installment, too much oil, leaking rear main(2 pc seals are infamous for this), wrong oil type. I recommend 15w-40 rotella for break in. switch to synthetic after 1000 miles.

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  #47 (permalink)  
Old 04-22-2013, 09:31 AM
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I drove my truck yesterday about 75 miles and the oil level has not moved a bit so far. I must admit the dealer's service dept that I bought the engine from has been very good to deal with. This engine has some torque reminds me of driving a big block.
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Old 06-25-2013, 09:03 PM
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Im Back... GMPP Makes Good I Think???

If you have followed for the last 7 months or so I have had two GMPP ZZ383 Strokers that have been oil users. The first one GM replaced after less than 1500 miles because it flunked a leakdown test. So they sent a new one. That motor used oil at a lower rate, but still unacepatble. So thay had my installer try a few things and then had me put over 4000 miles on the motor. No improvement. Well I just brought it back, post 4000 miles, and GM has decided to send another motor. So I am hoping that three is my lucky number and after this motor is broken in I can finally drive my car without documenting everything I do. Just want to run my car and enjoy it. One would have thought that for the $$ I spent I would have been doing that almost 1 year ago.
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Old 06-28-2013, 12:29 PM
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Boy, I really wish you the best.
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Old 07-01-2013, 12:31 PM
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Just as a note on oil consumption, I just put 1280 miles on the 57 Chev with the 283 PowerPack. 3/4 of a quart of oil was used for the trip. This on a 25 year old stone stock rebuild with a 0.040" overbore now with 80,000 miles on it. The extra 100cubes that the 383's have over my 283 should use more oil, all else equal. But you'd think that the newer tech in the 383's should seal up better than a 283 with the crankcase vent tube.

Good luck with the 383's guys.

peace
Hog
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  #51 (permalink)  
Old 05-12-2014, 04:51 PM
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Just completed build on a 36 ford coupe with a zz383. Just finished break in with slightly over 1000 miles and I have oil concerns. Given the fact that I bought this crate some 6-7 years ago I doubt GM or the dealer I bought it from will listen to me. I note a lot of experiences in this thread. Question is whether there is a common problem. I may just buy cheap oil as I don't want to pull the engine or even go down from top or up from bottom.
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Old 05-12-2014, 10:02 PM
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I break mine in using no breathers but instead two pcv valves. The object being to create vacuum in the crankcase. It helps the rings seat quickly. Ive been told this method can cause the main seals to prematurely fail though. I don't know if it does help but it didn't seem to hurt my engines. Do you suppose ethanol fuel has anything to do with your problem? It's a very long shot but maybe? I can't believe you're having this kind of trouble! GM must be slacking in the qc dept. Good luck and let us know what you find.
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gmpp 383 stroker, new 383 crate, new zz383, zz383 break in, zz383 oil

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