The 55 shop manual has the main bearing clearance at 0.001 to 0.004 for used bearings and the rods at the same clearance (0.001 to 0.003 for new bearings). The 59 shop manual has the same for connecting rods but something tighter for the mains. Hopefully that will help you decide. I have my inline set at 0.002 for all and it runs at 30 psi.
Good luck. Allen '50 3100 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Goulet, John A. Sent: Thursday, April 28, 2011 6:08 AM To: [email protected] Subject: [old-chevy-truck] Bearings; Oil Pressure ?? hi all Working on my neighbors 235 that is a circa 1957 block. Had poor oil pressure . Put in a new pump which improved things quite a bit. At this point, warmed up it is in the 3-20 range in the garage. Not likely to cut it on a hot day in July. Got him to do the rod bearings with Plastigauge. Says he got .0028" . Is that large enough to contribute to low pressure? (theory: a lot of tiny leaks = one good sized leak). I would have hoped for more like .0015. I assume the main bearings are comparable although he has not checked them yet. Any thoughts appreciated! The block is in a 1946 half ton. John ________________________________ From: [email protected] [[email protected]] on behalf of ccpanel [[email protected]] Sent: Saturday, February 26, 2011 11:19 AM To: [email protected] Subject: [old-chevy-truck] Re: Lucas Synthetic when you run out, valvoline syntech full synthetic has the most ZINC in a automotive oil BUT you should still use ZINC additive or continue to use one of the "racing" oils like lucas, royal purple, and so forth-you know $$$$$$$$ why? because our "NANNY" society thinks that ZINC is making engines last too long and so they are removing most if not all of it from oil. Our flat tappet cams need high zinc or extreme wear will occur... google it if you want to learn for yourself. mark --- In [email protected]<mailto:old-chevy-truck%40yahoogroups.com>, Ken Cluley <kdcluley@...> wrote: > > All > � > Just won 6 quarts of Lucas 5w 30 synthetic oil at a car show.� Can I use > this in the old truck for my next oil change? > � > Thx > � > Ken� > 50' 3100 Deluxe > > > > [Non-text portions of this message have been removed] > ------------------------------------ Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: [email protected]! Groups Links ------------------------------------ Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: [email protected]! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/old-chevy-truck/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
