95 Formula

iTrader: (2)

Better read this. I think on a normal application as long as it itsn't too crazy you will be fine. But on a high hp motor you may want to go to the select brand of melling. This is related to the m55 pumps most people use as stock replacements. I had ordered 2 and thankfully I saw that post before engine went in. Sure enough I measured the new style to the old m55 I had and there was a bid difference in the mounting flange. I reordered with a melling select 10550 which accepts our diameter pickup tube. Just though this would be good information for everyone to know and maybe avoid a potential problem. Just for safety I would upgrade to the select..its only about 25 bucks extra and you have peace of mind.
melling oil pump post

skinnies

iTrader: (33)

Wow, thats good to know.

KWIK WS6

iTrader: (4)

Yea, it is

95 Formula

iTrader: (2)

maybe this needs to be a sticky or something. My m55 pumps did come with the warning label they are talking about. Jegs has them back in stock now...lol.

Ls1Bait

I run a melling pump but stock motor mounts and stock rotating assembly. I used a High Volume pump not sure if its the same or not. Can only hope for the best

Matts94Z28

iTrader: (6)

weeellll i just put one in my car about 2 weeks ago along with my cam swap....damn

seawolf06

iTrader: (8)

Thanks Tim! Won't help me since my pump is already in, so I guess I'll just hope for the best. I'm not using solid mounts and not pushing that much hp. Now I have another thing to worry about breaking besides the 10 bolt. Where do you get your pumps from? I got mine from Engine Parts Warehouse.

the_merv

iTrader: (88)

I got the M155 Pump..wonder if I got something like this coming up.

DroppedM6Z

iTrader: (5)

i'm not making that much power but i got a HV melling and then found this out about a week ago. I sent mine back to CNC motorsports and got a GM performance stock pump.

95greenZ

iTrader: (2)

Thanks alot, now I got something else to worry about. LOL

95 Formula

iTrader: (2)

didn't mean to worry anyone. This is just a FYI thread. I don't know when the design changed so maybe some of you guys are ok. I know my old m55 had the larger housing but had other problems with it so it needed to be replaced. I think you are ok unless you are a high hp car and maybe then with solid motor mounts. Who knows. Dont make the mistake I did if anyone reorders and get the select pump that wants the 3/4 pickup tube. Make sure to get the 10550, not the 10555.

slagger

iTrader: (1)

Same here :-)
my rebuild has 7000miles so far and no prob but just watch and make sure it don't go down.
pretty sure I have that pump, I took picts and it looks like it :-(

96SOM383

See the bullshit make shift parts there making now put out a bad name for them.....

seawolf06

iTrader: (8)

Sounds like it wasn't Melling's fault...

NotACop97Z

iTrader: (7)

I read the entire post, the HV55 has the thicker mounting flange.

dhdenney

iTrader: (53)

I have the HV55 and no problems in over 4 years. I see that the HV doesn't count here though... Just had to raise my hand too.

95 Formula

iTrader: (2)

My old pump was a hv55. I had some kind of problem with it..not a casting but oil preasure was acting up so I got a new one. My old hv55 had the thick casting. I ordered the same part number as before and the new one had the thin casting and the warning labels to not use on high performance applications. I sent it back and got the select melling hv 10550 which had the same thick casting as my old hv55

94 F-body

iTrader: (1)

what would you all consider a crazy set up? more than 400RWH or less? what I am asking is where is the line for power so I do not cross it, I was told the LT-1 I bought was 315HP at the fly, it was spose to have came outta a cop car, (intercepter package) and I put the Mellings M-55 oil pump in cause I bought one for the other engine I was building but this was a steal for price and I need to get this car on the road. I am planning to add some power but rembering how easy the 4L60E and the stock rear brake I will be gentle till I can replace those parts for alot better ones, besides I would be happy with a 500 RWHP car for the street, I am in So. Cal. so...

Z284thgen

iTrader: (46)

well damn glad the motor has to come outta the stang before i get the swap done on the stang and fire it up

i dont remember warnings with mine but since its coming out to get the dome pistons im just gonna go ahead and check it

LS1-SEVEN

iTrader: (1)

bump,

I've got the the new M55 pump so I want to replace it for the peace of mind. You guys are saying use the 10550 pump? But I don't want to use a HV pump because I heard they can suck the pan dry(stock CI). I'm not going to use solid motor mounts, but the engine is going to see 6000-6200rpms and 350-400rwhp.

What about sealed power oil pumps are they good?

Thanks