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sapsz28 01-19-2011 07:25 PM

I have a 1981 Z28 with a 406 that I am building for it when the spring comes in it the cam I am leaning towards is a Comp Cams Hydraulic Roller Magnum 12-450-8 230@.50 int&exh and .560 lift int&exh,since I will be using roller roller lifters and rockers,and I know the sbc has a decent oil design,but is there anything I can do to improve the longevity of this motor for an oil pan I was going to go with the Moroso 20191 with the built inn baffles windage tray and crank scraper ,it's not so much as to save the power but to get the oil back to my pump so it can get it the oil back out there to do it's job as for the pump wright now,I have a 360 sbc with a melling m55hv which after lookin up is a high volume and high pressure unit it has an arp hardened shaft, stock pan,and a Moroso 2 quart oil filter with the the by pass blocked off I only spin her her to 5800 rpm she has a comp xe268 hydraulic flat tappet ,hell of a cam by the way ,and roller rockers,and a set of maxed out 041 heads.
how ever this unit with the roller bottom end and higher rpm potential when its fun time ,upgrading the heads as well going aluminum ,do I go for the same unit ,or just high volume or volume and pressure which hasnt failed me in 4 years,or even stock, or the moroso 22146 one thing is I do want to switch to a 3/4 inlet for the pick up inlet.Moroso also makes a pan #20190 which has the the same dimensions but only internal baffles no windage tray or scaper which I might not even need but as for the 7 quart pan and 3/4 inlet that I will do fo peace of mind and to give the oil time to to cool down a bit, between 7 quarts in the pan and 2 in the filter I think I will have my bottom end covered ,no punn intended.
If anyone has any experiance with the the same kind of vehicle, for vehicle pan selection and capacity with that kind of pump and or cam set up, any advice would be gratly appreciated,thankfully received and faithfully applied
. Thank you Brethre

bigdog7373 01-19-2011 07:51 PM

I'm not really sure what you're asking but normaly a stock pump does the job but i can understand why you would want a higher volume pump for the extra security.

sapsz28 01-20-2011 10:33 AM

oil pump & type
I'm asking should I go stock or more for a daily driver 2-3 times a month at the track and 6200 max rpm, which it will see at least 3 times a day, with a magnum roller set up cam 230@.50 lift .560 single pattern,and scorpion or harland sharp 1.5 rller rockers have not decided that one yet. any help or guidance guysI want to do it right the 1st time. Thanks 01-20-2011 10:54 AM

The most you need is an M55A Melling pump. AVOID the 3/4 inlet pump. Large inlet pumps have caused many problems for Chevy owners.. These pumps allow air cavitation on cold startup. Starving the front crank journals for oil.

Adam65 01-20-2011 11:02 AM

The m55 pumps are a weaker, thinner casting than they used to be about 5 years ago-they are notorious for breaking off. The Melling Select line of pumps are actually thickness of the old M55 pump body-with the addition that the pickups can now be bolted on. 01-20-2011 11:10 AM

You are correct. I am so used to using my old stock stuff (I bought all the old pumps my warehouse had). I had forgotten to mention the change. Actually I have two broken newer ones on "The wall of shame" (broken reminders of the past)

sapsz28 01-20-2011 07:59 PM

Oil pan and pump type
Thanks guys Adam the melling series you were talking about do you have any model numbers for them such as the "regular meling 689m55" ,then there is a line called high performance oil pumps with the code 68910555,both are same volume.
Moroso has aline to fit the pan Iam eyeing with the pick up welded on ,then they also have a line of blueprinted oil pumps as well, must it be so difficult.
As for pans does any one think windage tray and scraper or not ,baffling is a given regardless,anyone else

Adam65 01-21-2011 04:56 AM

If you're looking in Jegs, 689 prefix is just Jegs' number to signify a Melling product. On my 80-85 350 I just did, I used a Milodon street/stip pan #30901, with a Melling 10552 pump (which is stock pressure & 10% over stock volume). The only reason I went with 10% over volume, is I have solid lifters with the EDM holes in the face-otherwise would have went stock. The pickup depth to pan clearance was 3/8 or 7/16"-didn't have to mess with modifying anything.

sapsz28 01-21-2011 07:58 AM

oil pan and pump
Are there any 406 chevy owners with full hydraulic roller motors who can recommend a decent set up for daily drivers with 500ftlbs motors that will see 6200rpm max,5 ,6,7,quart,moroso, milodon,jegs again like all of you who cherish your hard work and money involved, i just dont want a catastrophic failure,i'm an assembler not a builder and would like to hear from someone who has done this more than twice,once for the build and once for the grenading of the motor,I know I sound like a broken record but successful execution relys on precise planning. Thank ou all again for your time.


Adam65 01-21-2011 08:30 AM

Since you have a 400, make sure that your oil pump driveshaft is the necked down one that is specific for a 400. (Due to the 2.65 mains, compared to the 2.45 mains on all other small block chevy's). A 400 driveshaft will work in any sbc, but if you use a non-400 driveshaft in a 400, it will rub where it goes through the hole in the main cap & block.

sapsz28 01-22-2011 07:31 AM

oil pumps & pans
Thank you for that usefull tip.

sapsz28 02-09-2011 07:55 PM

oil pumps and pans
ADAM 65 you mentioned a necked down shaft I called jegs and summit and Moroso and they all said its the same shaft for 350 or 400 sbc what make or model shaft are you reffering to specifically.Thanks again for the tip but I cant locate what you wrote about

cobalt327 02-09-2011 08:44 PM


Originally Posted by sapsz28
ADAM 65 you mentioned a necked down shaft I called jegs and summit and Moroso and they all said its the same shaft for 350 or 400 sbc what make or model shaft are you reffering to specifically.Thanks again for the tip but I cant locate what you wrote about

There is a difference:

Oil Pump shaft: 350 main = Stock shaft (.481” OD)
400 main = Stock shaft (.425”OD)

I personally have always used an ARP shaft, it has plenty of clearance.

sapsz28 03-03-2011 12:35 PM

oil pump shaft length
Thats it no filing or machinig just an ARP shaft,, thats what what I'm running in my 360 sbc right now. Of course I'll by a new one but is that all clean it and install,please tell thats it cobalt.

cobalt327 03-03-2011 12:51 PM


Originally Posted by sapsz28
please tell thats it cobalt.

OK: "That's it."

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