Mopar Performance Hydraulic lifters

[68r/t]

Some time ago I bought a set of Mopar Performance hydraulic lifters, they are new in a sealed box, now I just checked the part number on the boxes and it is listed as a solid lifter p/n P2843177.
The lifter is definitely an hydraulic one,  now I don't know really what I have.
Is there a way to tell the difference from a anti pump up and a std type lifter?
I have the std rocker setup and I don't want to go to adjustable.

[71superbee]

The Mopar Performance lists that part # as
"Mechanical Tappet sold individually P2843177 Tappet, mechanical 0.0005" undersize

[Ghoste]

Just to be clear, have you taken any of the lifters out of the sealed boxes to look at them?

[68r/t]

Yes I have taken them out of the sealed boxes, I have attached a couple of photo's of what I have got.
I don't want the solids so I,m half way there with knowing that they are hydraulic but I don't know if there std or anti pump up lifters.
Do Mopar Performance even sell a std lifter?

[firefighter3931]

That looks like a standard hyd lifter to me. 

The anti-pump lifters have a c-clip retainer at the plunger and yours do not. You're good to go with the stock valvetrain. 


Ron

[BrianShaughnessy]

That looks like a standard hyd lifter to me. 

The anti-pump lifters have a c-clip retainer at the plunger and yours do not. You're good to go with the stock valvetrain. 


Ron

I got a set of MP solids with a .528 awhile back and a bunch were missing the C clips.    Standard hardware store item but I really didn't like the way they were made so I bought a box of Comps.   Much better stuff.  I've commited to Howards for the next project.

If you take a pushrod or just about anything and push down on the plunger and it goes down and springs back up it's hydraulic.   

[68r/t]

Thanks for the replies, now I may be getting a bit anal about all of this but I was looking at Summits  and they show a picture of a small block lifter which has the wide oil groove like I have and there is a p/n and picture of a big block lifter with a narrow groove about 3/16  wide.

They have a diffrent p/n for a big blocks  and small blocks and they have different oil grooves.
Now if I was to buy a set of comps/ cranes etc they have the same p/n for big blocks and small blocks.

Is it O.K to use the small block Mopar Performance lifter in the big block? I can't see why not.

[BrianShaughnessy]

The pics in a online catalog are not the best nor could they even be of the same part.

You already have a mislabelled set of lifters from MP,  I'm leary of them already and you should be too.   I'd stick with Comp or Howards.   Summit sells several varieties of each. 

Crappy lifters along with the lack of sulfer compounds in todays oil are the biggest reasons for new engine fails with flat tappet cams.   

[Ghoste]

I agree with Brian.  Use those for nifty paperweights or sell them on e-bay but I would get a set of known quality and application lifters.

[68r/t]

I just a pulled a lifter out of a 383 that  I know has a purple shaft and lifter kit in it and the lifter has the narrow 3/16 oil groove, so I  presume the lifters I have  are small block lifters.
They most probally will work but I am not going to take the chance and just bought a set of Crowers ,which  has the same part number for big block and small blocks. the cam is also a Crower.

[Nacho-RT74]

what's an "antipump" lifter ?

[Ghoste]

At high rpm stock lifters cannot control oil flow quickly enough to maintain proper valve lash.  The anti-pumps prevent this.

[oldkimmer]

............That is a sb hyd lifter................kim..............

[Nacho-RT74]

At high rpm stock lifters cannot control oil flow quickly enough to maintain proper valve lash.  The anti-pumps prevent this.

and how ?

[Ghoste]

The basic idea with a hydraulic lifter is that it fills with oil when it's on the bottom of the cam and eliminates excess valve lash.  The amount of oil needed to accomplish this as the engine warms up changes and the idea is that the lifter can let oil bleed off internally to compensate.  When the engine is reaching high rpm it can "pump up" which really means it isn't bleeding off oil to allow the lifter to compress internally and compensate for the warmer and therefore expanded valvetrain components.  This ultimately means that the valves won't close completely and power is lost.
The idea with anti-pump up lifters is that metering inside the lifter allows it still bleed oil off under these conditions yet still operate correctly under normal operation.
This is an oversimplification and done in my laymans understanding but hopefully clears it up a little.  I'm sure one of the engineers or engine builders on the site can explain it more clearly and correctly.