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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,060 Posts1,055,838 Members48,427 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Most 235's I have seen in good shape have 30-35 max when warm and half that at idle.
If it is going much above that when warm I would suspect the relief valve in the pump is hanging up.
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