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What are your valve spring pressures? What’s the cam look like? I have confidence in my lifters. At least more in them than my valve springs at the moment. I’ve never had a small block that could turn more than 6k rpm so there is a significant possibility I’m doing something very wrong.

Mopar HD hydraulic roller lifters? How much preload? The lifters I’m running are the stiffest I’ve ever dealt with. Before I adjust the rockers I have to slowly turn the engine over and let it sit at high lift spots so that the lifter will bleed down over a couple minutes.

Microsquirt. Rev limiter set at 6500rpm, and I do not believe I even have any AFR safety’s available.

Oregon camshaft did not have a valve spring recommendation for me. He just said he wouldn’t run more than I already have. Another shop I spoke with stated they typically run 170-420 with magnum lifters. I’m running Elgin HL-2269s lifters where are supposed to be a slow leak down type. I have...

Under boost on a pull it will rev to 6000, but not beyond no matter the boost level. It does make a breaking up noise, but not popping. AFR appears about normal and timing looks good. I closed the plug gap from 30 to 22 with no change. Driving the car slowly increasing rpm(no boost) causes...

I had been worried about low oil pressure for quite some time which I discussed in another thread over in the Small Block Mopar sub forum. The general consensus was that my pressure is fine so I’ve moved forward with tuning, and now I’m running out of fuel and rpm! I hit 101% injector duty...

That’s a lot more back pressure than I would have expected from dual 3” I’m curious what mine might be with 4” down to dual 2.5…

Been messing with the car a bit the last few weeks. Here’s a conservative timing run at 12-13psi

I thought we were talking about the actual external filter housing. My block is tapped and plugged.

And I know the design on mine is pretty similar, and also cleaned up a bit. Since I do need to run an external filter is there a housing you recommend for better flow?

Maybe I don’t have a problem. I have been expecting 70ish hot psi at higher rpm. If 55-60psi is enough then I guess I’m good? FYI my oil temp seems to stay at around 90-210 once warmed up.

Sorry, I plumbed the filter and cooler back into the system just as it was to begin with. At that point my pressure was 75+ for about 5 miles, then fell back down to 55-60. I did not pull the motor yet. Just switched oil lines around

Put everything back together, and good pressure at 75+ psi. Drove it a bit, got on it a couple times and oil pressure back down to 55-60max. At this point I have to assume the pressure relief in the pump is getting hung up.

Filter and cooler were hitting 55psi. Oil filter alone, 75 psi. Oil cooler alone, 75 psi. I’m worried that if I hook everything back up it’s going to magically be at 75psi. Can oil systems get air bubbles? That doesn’t even make sense. The filter is on its side…

Looped my oil lines and found 20psi. Seeing 75 at 5k rpm. Now I just have to narrow it down between the filter/housing and oil cooler. Might still pull the motor to check everything out, but at least I have direction now.

I think I’d better loop the oil filter/cooler lines before pulling just in case it’s that easy, but I wouldn’t think a restriction would act this way.

I’ll for sure be checking the relief valve once the motor is out. I’m also guessing it’s not closing all the way. Checked main and rods already and they were good. Failed to check the relief when the pan was off, but not doing that in the car again. I’ll be checking bearings again either way...

Thank you both. Looks like there will be obvious discrepancies so I’ll prime it before pulling, and use the same oil so that I’m not changing other variables.

I don’t want to hurt the motor so I’m going to end up pulling it to check things out “the right way.” Will I be able to build sufficient testing pressure with a corded drill, or does it depend on the drill? What pressure am I looking for on the stand with what oil? I’m thinking I’ll aim for...

Maybe that’s how I’ll fix my problem :lol:

How to Install a High Press Spring in a Small Block Oil Pump I believe it’s positioned with the spring IN the cup. The spring is also positioned inside the cup on the, extra, new Melling pump I have. The second pic is a bit deceiving. The plug “face” is outwards so that the spring is...

It’s been my assumption that a leak or restriction would lower overall pressure, but that it would still rise linearly with rpm? Pressure comes up fast and just flatlines.

I have considered looping the oil lines to bypass the filter/cooler temporarily to see if pressure improves. I did smooth out the filter housing transitions to help with flow. Oil pump was port matched to the rear bearing cap, both are flat, and it has a gasket. Pump has also been removed and...

With or without. This is for a ‘71 duster with KH breaks if that matters.

Looking for a left side lower control arm. Condition isn’t too important, but I would need something that has a bushing installed so that I can utilize the sleeve; bushing condition does not matter either. Located in Phx Az area

Hello, I have a new build with oil pressure acting a bit strangely. I suspect a pressure relief valve issue, but I was hoping to get some input. The engine has less than 300 miles on it, but was assembled over a year ago and unfortunately the build notes were lost in a move so some of this...

This was surprising to me. My gt45 spooled much easier/quicker. I wonder if it’s our downpipe size? Which exhaust housing are you running on your 7875? The packaging is much nicer on the 7875, and success stories pretty universal across the web. The car sounds great!

Definitely agree, and it works out much better if the hat is pointing to the rear so you’re not running around rich on massive front jets. Then you have to get into lots of PVCR tweaking and the whole thing gets to be more complicated. Switching hat direction is where I really ran out of...

I went through the hanger 18mods on mine and it just never worked right. I’ve seen several others give up on them too. It was “okay” for a little while, but never optimal, and by the end not worth risking my motor. There are PLENTY of success stories out there, sounds like TT5.9 has had lots...