Some info to share about my SB 427 high oil pressure problem

[Davidless]

I bought a Ford racing 427 long block in this past May to go along with a new SF mk3. I had a blast buying stuff to dress it out and must say a very rewarding experience, it allows you to bond with your engine and personalize it. But that’s just me

Anyway when I got the LB I primed the oil system with a drill, what I noticed was that the oil pressure jumped to 100 psi, didn’t think much about it and being a novice at engine building but a mfg engineer by trade so I don’t feel I’m not a total dummy with most stuff, lol.

2weeks ago I found someone to run it on their test stand for cheep, after we timed and tuned the holley 750 we both noticed that the oil pressure jumped to 85 psi and pretty much stayed linear with the rpm increase, from idle to a brief 5000.

I wasn’t comfortable with this and sent the video over to Ford racing. They weren’t either but said the oil pump can be adjusted for the bypass spring force. I then called Melling and talked to Brain, he agreed with me and said you can’t turn down the pump force that much with turning the adjustment screw CCW.

The following week I built a test stand so I could see how the pressure behaves after the oil temp reached proper temp.

After just running at idle a few minutes and watching my gage read consistently at 85 psi I still felt something definitely not right with this pressure. Oil pressure should not be linear with RPM. If it was running at 85 at 6000rpm and went back down to 10 to 20 psi at idle I’d be ok with that but this is not the case.

I did some review reading in my Ford manual and it states that the oil pressure should be at 60psi running 4000rpm, this is more like it imo. Nothing is stated in the build list about using a high volume/pres pump either.

After contacting Ford again they agreed as will, said never had a problem like this selling crates for 20 years, l agreed with him, doesn’t make sense I got the only lemon of the bunch.

I had him check my serial number for any non conforming blocks that may have been made around that time, nothing

Well now I’m removing all of my parts to send back for their inspection, not sure what else to do. I don’t think it’s my responsibility to drop the pan and check, especially for what I paid.

Any how I’m glad I tested before putting in my car, will keep updating once Ford has a look at.