stock ls6 oil pump vs. ported
#2
I'm not sure about the PSI increase, but the last pump I got with a port job, was a joke really. There is some excess metal where the pick up tube connects to the oil pump and thats the part that gets hacked down. I'm sure it helps FWIW.
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#10
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I put a used TSP LS6 pump in my car. 50psi on a cold start and it will go from around 43-60psi driving around. Seems to be worth maybe 5psi at the most IMO, not worth it for a street car at all. Maybe if the car was a little more serious I could see some benefits.
#11
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I would go LS6 pump, and if you can't afford to port it don't worry about it. The pressure developed is determined by the bypass valve, which can be shimmed, but this isn't necessary either.