SBC oil pump recommedation

[Ed Wright]

Originally Posted by REGGIE WINKLES

Stewart oil pump, no worries, less H.P. to operate.

^^^^^ There Ya go!!

[Mike Pearson]

Originally Posted by Ed Wright

^^^^^ There Ya go!!

Ed, I talked to Larry this morning about his pump. He said he uses a Melling unit that he modifies. Do you know what base pump model number that he used. I am assuming you have one of his pumps. I am a bit leery of the melling pump as that is what broke in my engine. Supposedly Melling makes a higher quality line for performance engine service with a heavier casting. I will probably go with one of Larry's pumps in the end. Thanks,

[Ed Wright]

Mike, I'm sorry, but I don't know which casting Larry uses. Mine is in the engine, in the car, so I can't check. Larry would tell you. He is a good guy.

[Mike Pearson]

Originally Posted by Ed Wright

Mike, I'm sorry, but I don't know which casting Larry uses. Mine is in the engine, in the car, so I can't check. Larry would tell you. He is a good guy.

Thanks for the input Ed. I will give Larry a call. Good luck racing this year. We just finished up 5 races in 6 weeks here in Div 2. Now a couple of IHRA nitro jams next month. This is the busy time for us here in Fla.

[Mike Taylor 3601]

melling M-55A is heavier casting, m55 and m55hv have lighter castings,some things that will break pump are cavitation most of time pickup too close or far away from pan,or oil getting away from pickup or lack of oil, out of balance or vibration from driveline, oil pump shaft rubbing block some blocks need hole opened up or shaft that is undercut, some dart blocks need drilling for clearance around oil pump shaft.
Mike Taylor 3601

[Mike Pearson]

Originally Posted by Mike Taylor 3601

melling M-55A is heavier casting, m55 and m55hv have lighter castings,some things that will break pump are cavitation most of time pickup too close or far away from pan,or oil getting away from pickup or lack of oil, out of balance or vibration from driveline, oil pump shaft rubbing block some blocks need hole opened up or shaft that is undercut, some dart blocks need drilling for clearance around oil pump shaft.
Mike Taylor 3601

I think mine was one of the lighter castings. It was in the engine when I bought it. Thanks for the tips I will check for clearance. I think the shaft is one of the undercut type. I will change that too.

[joespanova]

I have both castings in my shop and the diff is very obvious. I believe mine is a Moroso version of the HV55 , which at the time of purchase was the heavier casting. That being said , I had a bypass spring break last year costing me a new block in the process as it threw a rod from no oil pressure and yours truly didnt have a low pressure warning light...I do now

[Dan Timberlake]

Please post some pictures of the broken pump, showing the location of the break, and also the "fracture surface."

[Lyn Smith]

Was going to buy a Moroso 22101,but it looks like it is just a glorified m55 mellings???Has m 55 casting on it.Isnt the m55 the pump the one with housing breakage problems?