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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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#56926 02/23/2006 6:48 PM | Joined: Feb 2006 Posts: 112 Member | | Member Joined: Feb 2006 Posts: 112 | i'm rebuilding a 58 261 i picked up. it's bored .125 over, jahns high compression pistons, cam says 272 on the end. i re-ringed it, new bearings. i'm wondering if i should put high flow oil pump in it or stick with stock. its got hydraulic lifters in it. thanks for any info. | | |
#56927 02/23/2006 8:45 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | If it helps, my friends healthy 261 has a stock oil pump. We did shim the relief spring with washers so it doesn't bypass until 60 psi.
To shim, he found a washer that was a snug fit in the spring hole. Addes a few washers and put on a guage with an 1/8" fitting on it to constrict the flow. Sat that in a pan of the oil he was going to run and spun the pump with a drill, usuing the priming tool. Then adjusted the number of washers.
Fred
52 3600
69 C-10
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#56928 02/24/2006 12:07 PM | Joined: Sep 2002 Posts: 158 knuckle head | | knuckle head Joined: Sep 2002 Posts: 158 | There are no hi volume oil pumps available,only the stock type pump.
A 228-302 GMC oil pump flows about 20 percent more oil,the relief valve is set at 55-60 psi .It's fairly easy to install the GMC pump in a Chevy by reworking the external oil feed line and pick up tube. | | |
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