Is the 1/2" oil pick-up mod of any great benefit to a bracket motor that will likely never see Rpm's above 6000?

Opinions vary....mine says no.

May not big a big benefit but it is a benefit. Take a thick milkshake, use a big straw and a little straw, which one is easiest? Oil pump has to do the same thing.

Guys have been running the stock p/up to 7000rpm`s for years w/out any issues but, it wouldn`t hurt.

i'd have to say IF the 1/2" pickup is the only change being made, then it is not gonna help much, if any.

I'm still of the opinuion that mods to the suction side of the system are just as important as mods to the pressure side. Given the relatively low expensive of the 1/2" pickup why not do it?

I asked Scott his same question as I was bottom tapping my block. We will be doing a few mods to the oiling system but the 1/2" pick up is not one of them.

I have never done this MOD myself .. but I know of some people that have. I don't really understand it ... IF you keep the passages on the OTHER SIDE of the oil pump the same.

B U T ... I have heard - more than once .. that after this MOD - the boss in the block has cracked .... and the pickup tube is now sucking-AIR ..and in one case the PU-tube became DISconnected from the block and fried the motor.

Some pickup bosses are too thin to tap oversize, if the boss is sufficiently thick the reason to do this is because pumps are more efficient at pushing than they are at sucking; therefore, mods to increase the size of the suction side make sense.

Rather than trying to drill the hole out from center, I took a die grinder and roughed out the hole, cutting into the block side and not taking any off of the thin side, then drilling and tapping took minimum off of the thin side, still not totally for the faint of heart, but can be done with common sense. If the block is thin to start with, its best not to try it.

Thanks for the good info. as usual

mods to the suction side of the system are just as important as mods to the pressure side

More important: reducing suction-side pumping loss is Rule #1 in hydraulic engineering.
General hydraulic guidelines for sizing plumbing:
D = .64 × (GPM ÷ V)^.5
Values for "V" range from 4 f/s for the suction (LP intake) side, 10 f/s for returns, up to 25 f/s for pressure (HP discharge) side.
This means that the pressure side can have an area as small as 1/6th of the suction side (25 ÷ 4) without compromise. Of course, these are pressures above numbers we will use, but the suction side is always larger than the pressure side.
If the pressure passage is about .500" minimum (remind me?), the suction side should be at least twice as large, or .71" ID. Schedule 10 1/2-14 NPT pipe is .674" ID, 3/8-18 NPT is only .545" ID.

Reason 2: a restriction on the pressure side is at least partially self-correcting - flow increases with pressure. A restriction on the suction side reduces pressure - always, the only question is how much, and is this level dangerous.

Reason 3: any suction at all on the LP is asking for cavitation, which entrains air bubbles, makes oil compressible, reduces its specific heat, adds load to the pump drive, and chews metal off the pump gears (examine a bronze marine propeller some time).

Interesting data poly .... most of that is GREEK to me !

BTW .... does anyone know if the basic oiling passages in a HEMI block are the same as a B-engine ? .. I don't know ... I have never owned a HEMI.

Yes, they are,Doc.

Poly said;
A restriction on the suction side reduces pressure - always, the only question is how much, and is this level dangerous.

That is the reason making this mod is worth doing.

23T ...all of that considered ... I would agree - the mod is worth doing. But WHY didn't Ma-Mopar have all HP motors with a 1/2" PU ?