360 oil pressure low under accelleration

OK this is a strange one. I rebuilt a 360 and it runs great (12.80's in a 3400 lb. Cuda) and the oil pressure is normal when cruising (30 psi. @ idle when hot and 58-60 psi down the hwy) but when I stop to torque it up for a blast the oil pressure goes down to 30 lbs. and just stays there as long as I'm into it for the full 1/4. It never builds any more pressure than 30-35 psi like it does when cruising normally. If I'm already running down the road and the oil pressure is up to 58-60 and jump on it it stays up fine as long as I'm into it. It's only when I torque it up (got a 3,000 stall) from a stop that it never builds more pressure unless I bring the rpm's up real slow. Then it goes to about 40 psi. I put about 900 miles on it and finally got around to yanking it back out and apart for inspection and frankly expected to see toasted bearings and find a faulty oil pump relief valve. Much to my surprise I couldn't find any problem at all. Every rod and main bearing still checked out at .002 clearance and bearings looked just like the day I put them in and the oil pump checked out fine on my test jig. I was really surprised to see the bearings were still like new cause I didn't take it easy on it even though the pressure showed low under acceleration.

Things I checked when apart include all bearing clearances (every one checked .002). Rod side clearance (.019-.022). Disassembled the oil pump and checked the relief valve and found no problem. Lifter bore size is .905-.906 which is a little loose but is this loose enough to cause this problem??? Checked to make sure all block plugs are in and they are.

I also tried adding up to 2 qts. of oil extra just to make sure it wasn't starving for oil under acceleration and it had no affect.

I'm running a Melling HV pump with the standard pressure spring and a Moroso pickup for stock pan and set to 1/4" clearance to pan. Also have a factory 360 windage tray. Stock oil pan. De-burred all the oil drain back holes.

Anybody else seen a problem like this or have an what it can be? I've rebuilt many engines over the last 25 yrs. but never ran into this problem.  

Sorry, I should have posted this in the engine forum. My oversite. I re-posted it there so if the moderator would like to remove it from here that will be fine. Fishy  

Rod side clearance should be around .010. Factory is .006 -.014.
You have too much clearance.  
age is no lock on brillance

3404spdvaliant I thought that was it also but my machinist is a long time Mopar racer and says he never has a problem running them with this much side clearance. He said his 340 has .030 side clearance and no problem.

Thanks for your reply  

Right on. Hey I read the other post and have seen 360 cracked at the lifter galley before.
So check that and try bosch filter I've had good luck with these. Are all your galley plugs new?, Did you change that old plug above the rear main it presses in and alot of people leave them in for a # of builds then they start to leak and bye bye oil pressure.
Just a shot in the dark.  
age is no lock on brillance

All the galley plugs are new except for the one above the rear main. I didn't have one for it but I shined a light down to it and it looked OK and was clean after hot tanking. I also measured to make sure it was in the right place and it was.

Thanks for the suggestion for the Bosch filter. I wasn't really sure what other one to try. Another guy mentioned a different filter in the other thread and I also had another Mopar guy tell me the same thing a couple days ago.

Thanks