Steve85

I ordered a 10553 a few weeks ago and it was available same day at Summit.

I had some dowel issues recently resolved...

The 10553 with a canton pick-up fits great in the canton 240-T 7" road race pan. Here is a pic of the unit.

Slalom4me

A fitment issue with the pickup led dmaaero to install an M55A, the
standard volume, high pressure pump.

His engine is back together and oil pressures are 70 psi at idle and
80 psi at cruise.

.

Desert1957

Guys,
I have 3 Melling M55HV pumps ready to go on customer engines , here is what they look like at the bolt flange.
Also I like using a stud to mount the pump anyway.
Note how much thicker the mounting casting is , and no bushing insert like on the cheap pump.also made in USA casting?



Desert

Slalom4me

I've given up on ever getting the standard spring from Melling through
the source I've been waiting on.

I have also purchased a 10552C - a heavy duty casting with anti-cavitation
grooves. It happens to have a slightly taller set of gears (to provide
10% more volume) so the body is taller overall. It also has a 3/4"
inlet with provisions for either press-in or bolt-on pickup. I'll provide
pictures eventually.

Meanwhile, this post keeps the thread open for a while longer.

.

AGENT 86

I talked with the melling rep at the Lordco trade show last week. He blames the fracture on wheel hop and solid motor mounts. He told me he knew who I was talking about.
If that's the case, then I have nothing to worry about.
I also looked at their billet pump, now that is nice !!

85vet

BS on melling - I do not have wheel hop or solid motor mounts. Jese, maybe he is talking about my solid roller cam

Slalom4me, I have the same additional 10% pump. Had to have a pickup manufactured.
with 0-20 racing oil, engine warm, my pressure is 22 at idle, but hits 55 - 60 at full throttle.

85vet

Just curious, are they newer or older pump.
if newer pumps, then there are multiple changes being made to these pumps.

LD85

I bought new Melling 55HV back last June, I will heck mine over when I pull the engine on Friday.

96lt4c4

I just bought this same pump a few weeks ago. This is the exact pump that I received. Let me know if you see any issues. I was thinking about sending it back and getting the select pump. After reading all this of course.


Also, I was just looking at the box and it says "New Generation" M155HV

Sprocket Head

your my hero 85, you sick watch dog!!.

edoad

Nice to learn about these things. Saw this thread and looked at my new oil pump. Even comes with a warning "NOT FOR HIGH PERFORMANCE USE". Ordered new pump.

edoad

Is the base plate, other than the pickup opening and the 3/4 " tube size a bolt on fit from the M55HV to the 10552 ?

85vet

The 10553 is the direct replacement. The 10552's body is longer, therefore the pickup has to be shorter. I had to have a pickup built to be able to use the 10552. Go with the 10553 unless you need the extra 10%.
http://s8.photobucket.com/albums/a26...53vsM10552.jpg

edoad

It might work for me because the pickup was a little short anyway. I am going to cut off the matchbox and weld it to the bolt on pick up or just change the bottom plate. Will see when the time comes.

Z06_BluByU

they address this in this months hotrod readers letters in the back.. they said to become GM's supplier for the pumps that GM requested the change.. stock pump is not for solid motor mounts or hot engines.. they have another part number for those types of cars.. check it out www.hotrod.com or get this months issue..

85vet

It took them long enough. An email was sent to hotrod, chevy high performance, gm high performance about this issue in 2006. I wonder why the GM mags have not responded or noted the change????

ztrips

I ordered my MV-155HV, pickup and pan from Canton 03/2005. When was yours ordered?? Am I correct that my pump is probably the "weak" casting?

Eike

Today I got my Golen 383 short block ... I ordered it with a stock volume oil pump.

What I got is a M55HV and it looks like the strong casting ... do I definitely have a high volume pump?
If so, what is the best stock volume pump to buy?





Best wishes
Eike

Midnight 85

I would have to guess yes it is the weak casting. I ended up going with the Canton pan and pickup with the Melling Select 10555 which is the high volume pump. I had to raise the pickup just a bit by using a rubber hammer on the bracket. I've got good clearance and oil pressure is 65-70 on the road hot with an idle pressure of around 40 also hot. I'm using Mobil 1 10w30. Although Melling execs should be hung for doing this to the performance crowd I have to admit the select line is some nice equipment.

Desert1957

There are 2 different pumps from melling , normaly a High Volume pump can be high pressure or not depending , longer gears make more Volume at the same speed , the relief valve spring is what makes it high pressure .
What all that means is in my experience a High Volume/High Pressure oil pumps can suck a stock oil pan dry at 6000 Rpm , maybe less.

So unless you have a super BAD *** Race Motor I would stay away from the exotic super high pressure pumps , you don't need it.

I like high volume but not high pressure , just my .02

If you talk to any good engine builder who has an engine dyno , they will tell you just enough pressure to keep the oil film on the bearings any more pressure is wasted and can even take away Horsepower at high RPM's.

I would keep the pump you have just put a stock relief valve spring in it , its an easy swap.
that way it has high volume but not 60-80 PSI.


Desert