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It didn't do that, yet; and thanks for the info.

Chris142, Your mention of .10 is the same number that Jasper gave me when I called to question the low oil pressure. What I didn't understand is whether or not they used .10 undersized bearings. Is that a requirement when ground by .10? Thanks if you can answer that

Thanks to both of you for the additional possibilities of what could have gone wrong.

Thanks ARCOgraphite, There's so much info coming in. I'm not aware of most of it, but since I'm going to have to let a shop make it right, I'm not sure I'm going to be able to convince them to take it all into consideration.

Thanks Jerryg, I'm going to start first with replacing the oil pressure relief valves. After that, if necessary, it'll be the oil pump. Didn't know about the high volume one.

This engine, when at operating temp, sounds the same as the original in its prime at RPMs between 2K and 4K. When at operating temp, the oil pressure at idle (600 RPM) is about 8#, 2K is 20#, at 3K is maybe 22# and I haven't stretched it to 4K. On an 8% grade for about 10 minutes, the pressure...

Thank you for the insight into the wide range of issues that could possibly be the cause. Pulling and installing in a Class A MH is not as simple as in a car. But you're experience has much validity and can't be ignored.

Thank you so much. You've really helped me understand. Have a previous shop owner coming over tomorrow and we can discuss your info. Thanks for taking the time to give me the information.

Thanks for the additional info. I'm really hoping it may be an oil pressure relief valve issue. That' easily solved.

Hi clinebarger, The workhorse chassis from National came with a 454 7.4 L engine. I don't know what a "454 HO" is. Jasper shipped a complete 454 engine, not a short block. The installation shop reused the injectors from the original engine. There is no crate engine involved; so, I don't think a...

I'm hoping none of that is the reason. I've also heard from others that Jasper isn't the top quality supplier of remanufactured engines

Agree if it comes to that. Looking at an oil pressure relief valve issue first as that's the easiest fix.

I'm also wondering along the same line. I do not know if it has an oil cooler. Need to find that out. I did see that there could be 2 oil pressure relieve valves. My one question about that as the being the problem is that it gets up to 60psi on a cold start, and doesn't drop too fast until it...

Hey Red Spider, Off hand, would you know if an oil pressure relief valve could be the issue? Thanks, RAB TX

Out of the question on a 2000 Motor Home. But that may be the only solution.

I fully agree with your answer, but how to convince Jasper is and continues to be the problem. If the crankshaft can be removed with the engine in place, I could go along with doing that, provided Jasper agrees.

Don't know how to force them to fix it. It's in a 2000 Motor Home; so, putting in a completely new/different engine isn't in the options list.

Mechanic connected directly into the engine with a digital gauge

Jasper said it's within their tolerance. Not a good answer to me.

The old engine had good oil pressure on 5W30. Really confusing now.