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Hello all,
My engine has 75K miles on it. Hot idle pressure was around 15 psi and hot running was around 40 psi. I had the rocker shaft rebuilt and the hot idle went up to 25 psi and the hot running pressure was up to 45 psi. I replaced the pressure relief spring with no change.
I just shimmed the spring up by .120". Now cold idle is at 55 psi. Cold running is up to 65-70 psi with keeping the RPMs below 3000. Hot idle is at 35 psi at 700 rpm. Hot running is 55-60 psi.
My question: Is the cold running pressure of 65-70 psi too high? I have read that it should top out at 60 psi. It runs this way for about 10 minutes and then stays below 60 psi.
Thanks,
Mark
My engine has 75K miles on it. Hot idle pressure was around 15 psi and hot running was around 40 psi. I had the rocker shaft rebuilt and the hot idle went up to 25 psi and the hot running pressure was up to 45 psi. I replaced the pressure relief spring with no change.
I just shimmed the spring up by .120". Now cold idle is at 55 psi. Cold running is up to 65-70 psi with keeping the RPMs below 3000. Hot idle is at 35 psi at 700 rpm. Hot running is 55-60 psi.
My question: Is the cold running pressure of 65-70 psi too high? I have read that it should top out at 60 psi. It runs this way for about 10 minutes and then stays below 60 psi.
Thanks,
Mark
