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Oil Pump. Regular or High Pressure?

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Elwenil:
The small block pumps are in the pan, so hopefully there are not any frame clearance issues, lol.  I agree that the pick up should ALWAYS be replaced when you replace the pump, do a rebuild or bearing replacement.

The frame clearance issue on big blocks is common.  High volume pumps have a deeper rotor assembly to carry the extra volume and that makes the pump longer.  I have seen a few guys modify their frame to make it work but I don't recommend that.  Oddly, my old 383 had a high volume pump and it fit in my '74 W100 fine but you would need to lift the engine to change it.

FJB:
Ok so High volume in staid of High pressure, I got that...now...

Is there any external difference on the high volume pumps which may afect the way they fit inside my oil pan? Or they look the same and they just put out more volume???

Thanks for the advise.

P

Elwenil:
Small block pumps are a little odd.  I had a Melling high volume pump that was a little taller design then the stock one, but there shouldn't be any clearance issues with any stock pan or windage tray.  I have also used the Mopar Performance long rotor kit a few times but you have to watch the rotor clearances with the cover plate.  I've had to make a small gasket spacer out of paper to get them right.  On the other hand, all of the Sealed Power high volume pumps I have been getting are the same size externally but have a larger rotor diameter but with the same size external housing.  Either way you shouldn't have any problems.

As always, when installing a small block pump, be absolutely positive that the pump snout is engaged correctly and the pump is sitting flat and flush with the main cap or you with bust it when you tighten the bolts.  This is critical and you will ruin a brand new pump if it's not installed correctly.  also, I'd steer away from the high pressure spring kits.  They typically will open the over pressure valve in the bottom of your oil filter and let all the dirty oil bypass the filter.  A high pressure pump should only be used with high flow filters such as the Mopar P4529190 filter.  It's also important to note that they get most of their high flow capability because they will allow a lot of small particles past that stock filters will catch.  Race filters are for race engines only.  And since I am on the subject, I personally feel that if you have a Mopar V8, you shouldn't use anything less than a Mopar 5281090 filter.  There is a huge difference in quality as compared to a Fram or other similar filter.  I've had two Fram filters bust a seam so I refuse to use them.  Just my .02

hrhitter97:

--- Quote from: Paco_Barroso on May  8, 2007, 11:40:36 AM ---Ok so High volume in staid of High pressure, I got that...now...

Is there any external difference on the high volume pumps which may afect the way they fit inside my oil pan? Or they look the same and they just put out more volume???

Thanks for the advise.

P


nope they are the same dimensionally, just flow more internally



--- End quote ---

chrysler300le:
They don't make high pressure pumps for small block Mopars.  The High volume pumps are also high pressure pumps.  Don't use them for a stock engine.  Especially if you have half groove main bearings which 90% of mopars do.  I've been down that road before and I've argued about it on this site many times.  High Volume pumps are only good on small block Mopars if you have enlarged oil passages.  There is no where for the extra volume to go.  The stock pump is more then adequate.  The extra volume is just returned to the pan and it aerates the oil and heats it up.

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