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1916 - 1936

1928 Chevrolet AB Canopy Express

Discussing issues specific to the pre-1937 trucks.

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#693669 Wed Nov 10 2010 02:14 PM
Joined: Jul 2004
Posts: 39
ia49 Offline OP
Wrench Fetcher
Just a quick question. I have a chance to replace my original 216/3speed/etc. with a 56 Hydraulic lifter 235/ t5 and open drive. My issue is with the 235, it runs good but the oil pressure at 1800rpms/60 mph is 25lbs. specs say 35 at speed. what to worry about?

Last edited by ia49; Wed Nov 10 2010 10:45 PM.
ia49 #693689 Wed Nov 10 2010 03:13 PM
Joined: Jun 2010
Posts: 295
I have a 56' 235 in my 49' 3600 and it runs at 25lbs also.

1949 Chevy 3600
1975 W-25 Hurst Olds
1991 Chevy Silverado
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado
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bztguy #693823 Thu Nov 11 2010 01:08 AM
Joined: Jan 2001
Posts: 5,317
The Idle oil pressure tells more about bearing clearances.
If you get about 15 PSI at idle you are good.

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Pre '68 Dave #694286 Fri Nov 12 2010 03:33 PM
Joined: Jul 2004
Posts: 39
ia49 Offline OP
Wrench Fetcher
THX for the replies. She runs at about 15 lbs at idle when warm and 25 lbs at 2000 rpms. It's a little hard to tell as the guage messures 0 to 100Lbs. THX again.

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