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Old 11-07-2016, 12:00 AM   #104
MTCK
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Join Date: Dec 2009
Location: Fairbanks, AK
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Re: L29 454 Build for '63 K15 with NV4500

I pulled the bypass valve out before initial startup, so I can't speak to the before / after. It pins the gauge at 60psi when cold and it drops to about 20psi at 600 rpm idle with 200F oil at the other extreme.
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1991 V3500 L29 454 4L80E NP205 D60/14 Bolt 4.56's
1984 K30 292 TH400 NP205 D60/14 Bolt 4.56's flat bed 7'6" Meyer Plow
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