M77HV oil pump questions

2935 Views 7 Replies 5 Participants Last post by 69NovaSS, Sep 13, 2006

Discussion Starter · Aug 25, 2006

Hey Guys,

in the early '80's i built a 327 and was told by a knowledgeable person to use the Big Block oil pump on my SBC... i did... with no adverse effects that i could ever ascertain... has anyone else any experience with this ???

i appreciate the help... thanks

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Mike Feudo

· #2 · Aug 25, 2006

People did things like that before anyone (except the really serious engine builders) knew any better. In about 99% of the engines you don't even need a 55HV pump let alone a 77HV.

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Discussion Starter · #3 · Aug 25, 2006

OK, thanks alot Mike... as i said this was a looong time ago. i've been somewhat out of the picture for quite a few years and was looking for insight.

i appreciate yer help, Thanks

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Motorhead62

· #4 · Aug 25, 2006

The M55 will work just fine on a small block engine. You do not need a High Volumn pump. Set the clearances to proper spec and run good oil and all will be fine. I use Valvoline 20W-50 Racing oil in my HP engines.

Good Luck

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Big Dave

· #5 · Aug 26, 2006

The high volume pump requires more power to drive it so it loads the distributor gear more than intended this causes a shift in timing (slight but measurable) and it accelerates the wearing of the gear if you are using a brass gear. If your motor leaks enough to justify the need to require a high volume pump it is time to reconsider your priorities about bearing clearances.

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Discussion Starter · #6 · Aug 26, 2006

getting ready ta build my first "Real" engine in 25 years... HA !!! am i showing my age ??? Crap !!!

just thought i'd ask... it was something that was done a zillion years ago, yes i understand... my reasoning for asking was not only that i ran one years years back, but Moroso still lists the M77HV as an optional pump... this, while researching my oil pan, i thought about, so i'm asking

i appreciate the help Guys...

the Shifty one

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wildman926

· #7 · Sep 9, 2006

I just installed a new oil pan on my 350, with built in windage tray and scraper, and I use the standard M77. I have 10lbs of pressure at idle, 40 at cruising and this is with standard 30 wt oil on a solid ft Lunati cam with edm hole lifters. I will change back to 10-40 wt once I get some more miles on the engine.

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69NovaSS

· #8 · Sep 13, 2006

wildman926 said:
I just installed a new oil pan on my 350, with built in windage tray and scraper, and I use the standard M77. I have 10lbs of pressure at idle, 40 at cruising and this is with standard 30 wt oil on a solid ft Lunati cam with edm hole lifters. I will change back to 10-40 wt once I get some more miles on the engine.

You only have 10lbs of pressure at idle with 30 weight oil?

you really might not like what you see for oil pressure when you drop down to 10 weight (for those that dont know the pressure will very likely be less with the lower weight oil)

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