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Old 02-20-2006, 02:12 PM
roy383ci's Avatar
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hv big block pump for small block

hello
today a wanted to weld the oil pick up
to my new melling big block oil pump.

but i noticed it was a hv pump(m77hv)
i wanted a big block pump for my new
383 small block (xe 284cam edel rpm heads 1:10.5comp)no daily driver.

would this be over kill and give me trouble or should i go for a normal
big block pump.
i have a kick out sump on my oil pan (1.75liters more oil)

i wanted to ad a big block pump to my new engine
for the better oil pulses 12 teeth instead off the 7teeth from a standard
small block.

thanks for reading

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Old 02-20-2006, 02:27 PM
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I would go for a standard volume SBC oil pump.
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Old 02-20-2006, 02:29 PM
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I agree, unless you have excessive clearences, the big block pump and even the HV small block pump is overkill, the SBC has a outstanding oiling system, the stock melling replacement pump with a few mods works fine and doesn`t require as much power to drive as the others.
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Old 02-20-2006, 06:34 PM
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I think the big block pump is overkill. Pumping more oil takes more power and it just gets recirculated back it inlet side of pump. Also high pressures are tough on distributor gear and cam.

I have a high volume small block pump from Moroso with all their little "anti-spark scatter groove" tricks in a pretty much stock 350 engine except for larger oil pan and a few other things it puts out 70psi+ cold and 55 hot with 10w/30 oil. That should meet your needs. IMHO
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Old 02-20-2006, 11:38 PM
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my .02 for what its worth. I have a BB pump on my street 406 that was installed by local racing engine builder. It has a 7qt pan so it doesn't pump dry and its like someone turned on the faucet on top each roller rocker.
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Old 02-21-2006, 04:17 AM
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thanks for your info and experience

OK a hv big block pump is overkill
so hes going out of the door.

but a normal bb pump puts out 10%more
then a stock small bl pump and a hv small bl pump 25%
am i right

the clearance on my new crank bearings
aren't that tight, and and sinds the new motor
is still in parts and i still could
change it to a small blower motor (weiand142 and change compression)

witch a haven't decided to do yet
so do i need al Little more volume/pressure on my
crank bearings.

thanks
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Old 02-21-2006, 04:41 AM
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i have a 406 with a 7 qt. pan and an oil cooler so i use the M99HVS,bb high volume high press. pump.i have one of the 77's like yours also sitting in the garage for the next motor.you should have gotten an extra spring with it that is used in the older corvette's with 65 psi.i would put that spring in it and use it.you'll get 65 psi and a little more volume and bb pumps work much smoother with the extra teeth.i always use a bb pump in my sbc's.i like the extra assurance.

Last edited by GoneNova/406; 02-21-2006 at 04:46 AM.
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Old 02-21-2006, 11:29 AM
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how do you know which oil pump pick up to use with a big block oil pump? isn't a small block pump tube smaller in dia. than a big block? can you still use a windage tray in the small block using the big block pump?
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Old 02-21-2006, 11:43 AM
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Quote:
Originally Posted by 406 ss monte
how do you know which oil pump pick up to use with a big block oil pump? isn't a small block pump tube smaller in dia. than a big block? can you still use a windage tray in the small block using the big block pump?
Use the BBC pump pickup too. Just measure for clearance and tack it in place.
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Old 05-24-2006, 07:52 AM
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The newer "pressure balanced" SB pumps work great.

I use high pressure SB pumps on my street/strip and stockcar engines when the clearances are good. If building a "loose" engine, I use either the BB pump or a HV SB pump with equal results. I know that some builders recommend HV for engines that are going to be used for long races, such as road racing or long-track stockcar.

Most companies now make SB pickups that fit the BB pumps since the SB HV usually have a bigger inlet.

The problem with overkill is that it creates as many problems as it cures. The excessive bypassing of the oil creates heat and adds to airation of the oil, so be safe but don't get carried away.

Other problems to be sure to address to lessen the chances of a vortex forming at higher RPM when the oil level is at it's lowest with HV are cleaning up the return passages to be sure of quick return to the oil pan as well as the pickup location and shape .
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