Thread: Big block oil pump in a Small block

Tweet

I am installing a big block oil pump in my small block 1964 327.

What pump pickup tube/screen could I use?

I want to use the stock oil pan from the engine.

Funny that this has come around to this--years ago there was a move to install small block pumps in big blocks to take less hp to pull the pump

Not to sound controversial - but why are you doing this? There's some mighty fine high capacity small block pumps that are a direct bolt in without any messing around..

Originally Posted by glennsexton

Not to sound controversial - but why are you doing this? There's some mighty fine high capacity small block pumps that are a direct bolt in without any messing around..

You are right. But a big block melling pump is 39 bucks. Circle track guys have been doing this for years. It will give me the extra oil I want for my flat tappet solid lifter cam at idle.

I did this years ago with a but can't remember what pickup I used for the stock pan. That was the sweetest running small block engine I ever built back then that seen 8000 RPM'S (and more with a missed shift) daily and never came apart.

Okay – Now I understand what you’re after. The big block pump bolts onto the small block but requires a short, (5.625" long) shaft. Moroso makes one - Part #22090. Remember that if you’re working a 400 block small block, you'll need to machine the pump shaft opening to 9/16". The BB pump will probably cost you 2-3 horsepower, negligible really – unless your all out racing.

Remember too that there are two different size pickup tubes, 5/8" or 3/4" and that you need to have the pickup sized correctly for the pan you’re using. Go to Moroso's web site and they have all the options..

http://www.moroso.com/catalog/catego...?CatCode=17006

Have fun,
Glenn

why go thru all this ? melling makes a m155 3/4 inlet and a m155hv 3/4 inlet its a sbc pump i use the 3/4 inlet on some builds that 3/4 pickup pump has been on most mid 90s sbc

Originally Posted by pat mccarthy

why go thru all this ? melling makes a m155 3/4 inlet and a m155hv 3/4 inlet its a sbc pump i use the 3/4 inlet on some builds that 3/4 pickup pump has been on most mid 90s sbc

That pump will not give me 40 psi at idle. This is were I need the extra oil pressure and flow so I don't wipe out my flat tappet solid lifter cam while its trying to push the double valve springs.

Originally Posted by Bouncer

That pump will not give me 40 psi at idle. This is were I need the extra oil pressure and flow so I don't wipe out my flat tappet solid lifter cam while its trying to push the double valve springs.

B.S what makes you think this ? the 155 hv will give you 40 at idle but that would do like any size pump as how loose the rods main s and side clearance is. used the EDM lifters will add oil were needed with very small amount of oil PSI drop if any. there things that can be done to the block and rods to add oil as well you should not need a bbc oil pump most all my sbc builds can do 40+ at idle and with soilds you can rework the upper oiling for more lower oil psi and oil.to much voulme all thats going to do is push all oil to the top end .you need to adress drain back this no magic number on psi will not = voulme or if lifters are going to wipe at 30 psi or 40 psi it is oil getting on the foot of lifter and good oil at that

Your reason for using the bbc pump sucks---but if you want a good pickup for it get a Milodon #18000

If you do things to improve oiling , you will see a pressure drop--thats a sign that there is more flow

Ok My reason sucks and idle oil pressure depends on bearing clearance.

Both statements hold water but this is what I am going with because it works with a very low dollar investment. This engine is fresh by the way, not a scrap yard re run hope and prayer. If I had 400 extra bucks laying around a roller cam would be my first choice.

Reminds me of what I was told years ago about running aluminum rods in a street engine. They won't last. Ran that one 4 years and sold it still running strong. That one had 100 pounds of oil pressure at 9500 rpm's.

the 155hv is $50.keeping solid lifters from wiping . has not one thing to do with oil voulme .as for alum rods ? i knew of a guy that ran 3 beam alum rods in a bbc tow truck .i do machine work for a guy that buys alum used rods off e bay. it all works till it jump ups bites you in the ass .as for a bbc oil pump and what pick up that would have to do with what oil pan and how deep the new sbc 155 oil pump has a 3/4 pickup tube so that could work or the bbc or any of the after market pick ups but you have to start with how deep the pan is

All that oils the contact surface between the lifter and the cam is splash anyway.... If you want guaranteed oiling to this area, Comp sells a fixture to cut a groove in and insure oil to the cam/lifter mating area...

Thanks Pat I'll take a look at the pickup.
Your so right, It all works till it bites you in the ass!
Aluminum rods in a tow truck, who would have thunk.

Thanks Dave.
The grooves are cut already. Your giving away all those little
secrets.

Originally Posted by Dave Severson

All that oils the contact surface between the lifter and the cam is splash anyway.... If you want guaranteed oiling to this area, Comp sells a fixture to cut a groove in and insure oil to the cam/lifter mating area...

yep dave that works but works better i feel is the E.D.M lifters or whats called a direct lube lifter. the groove tool works better for a hyd lifter were you can not burn a hole thru them or a soild roller if you want more oil and not have hippo lifters

Originally Posted by pat mccarthy

yep dave that works but works better i feel is the E.D.M lifters or whats called a direct lube lifter. the groove tool works better for a hyd lifter were you can not burn a hole thru them or a soild roller if you want more oil and not have hippo lifters

Yuppers! At your suggestion we spent the extra $$$$$ and put them in the 501 in the Comet last winter. Tore the engine down for it's annual checkup couple weeks ago---not a mark on anything in the valve train... Thanks!