Lifter noise after high rpm pull

Normally my 350 is very quiet. I have electric fans so when they are off it's almost silent at idle under hood. Get a little rod knock for about a second when starting hot at times. Oil psi 40 at idle cold and 10-20 hot. 20-40 driving hot. Never over 40.
If I'm out racing people around town I get lifter rattle pretty good after a high rpm pull. Rev limiter is set at 5200. We have a big hill in town that is over a mile long and pretty steep. Very fun for a quick street challenge when meeting the right guy at the bottom.
I'll hold 4k or slightly higher for almost a minute at times. I know just don't do that but can't let little turbo cars think they are fast.
Think I'm just in need for a rebuild. It will quit rattling the next day after driving a bit or may not be there at all the next morning.
Could I just be starving the top end after time? Lifter sticking? I did have the oil pump booster mod plate. And it seems like it's just one or two lifters not all of them.
Stock cam and lifters with new style but older rocker assemblies. No other oiling mods.
Never runs bad just rattles.
Killed a Subaru WRX last night but came home rattling loud. Completely silent this morning. Afraid I'm gonna kill my engine if I keep it up. It's so hard though.

 

No it's stays ticking for a day or two usually and yes at all rpms until it's gone

 

I think I'm just starving a lifter and it takes a bit for it to want to pump back up?

 

Ya I do use Just regular 15w40 diesel oil
Maybe should run 5w30
Just have always thought old worn motor could use the thicker oil? Maybe I'm causing it?
Usually very quiet in morning while warming up and while hot
Never really get much over 40 psi though
Maybe oil too thick

 

Ya I don't believe any springs got changed wasn't the high volume and psi kit just the booster plate and gaskets is all
should I get a different spring for higher psi and run 530 or 1030
I see ta says they don't recommend the kit they sell due to dist gear wear?

 

Or try the TA allen bolt trick. It'll take abt 2 minutes to try it...
Should increase max pressure abt 15 lbs.

 

Haven't heard of the Allen bolt trick tried searching not finding specific directions. Got a thread to recommend for it?

 

Thanks Larry, you're on top of it!

1/4" dia. fine or coarse thread, doesn't matter.

 

Add some transmission fluid to the engine oil it will help free up the sticky lifter.

 

Thats dismal oil pressure for winging it to 5200 rpm.
The "Little rod knock" would be a HUGE concern for me.
The bottom end should be quiet upon start up even before oil pressure is established, reason being........ theres always going to be the presence of oil between the bearings and journals after shut down, that presence of oil IN A HEALTHY ENGINE, is more than enough to provide lubrication until pressure is established in the first few seconds upon start up, just dont go revving the bags outta it until pressure is established.
Sounds like you have EXCESSIVE clearance in some bearings causing the knocking upon start up until pressure is established to take up that excessive clearance, sounds like the damage is done, and no amount of raising pressure now will cure it, it will be a band aid.
The noisey lifters tell the story, the oil is hemorrhaging from the bearings (main, rod or both) starving the lifters.

 

Thanks will give the bolt a try and see if that helps. I agree Mark it's an old worn bottom end the heads were done years ago so it's time to start planning a rebuild.
This car screams and it's all bolt on mods, stick internals. Can only imagine what a built block and heads would do.

 

"They run best just before they blow up" - clearances have opened up and there little friction inside...

 

Give it some more oil pressure and run ‘Er till she won’t…….

 

Not sure if 5,2k is actually in the screaming category.

 

Ok ok your right not a high revver
But damn fun
I have it set there just cause I know if I pushed higher it wouldn't last and it's my daily driver