EMC report

[Yellow Truck]

Those are vents. They are tall enough to not let the excess oil in the valley drain back onto the cam and cause excess windage. They must be hollow to allow proper ventilation from downstairs.

So I am assuming a hole or passage was machined into the block and it is a brass hose barb to a pipe thread (or similar) and then threaded into the hole.

[TomP]

I assume also that the oil is all directed back away from the crank and cam or maybe even an external drainback ahead of the flywheel?

[MeanGene]

Or just puddling oil on the lifters

[frnkeore]

It looks to me, that he is raising the oil level, to oil the lifters, in the valley. Then draining the right side, to the rear and the left side, to the front, to even the flow back, away from the crank.

It looks like he has siliconed the front drain back closed, on the right front, to that end.

I would also guess that the oil to the lifter galley has been blocked, to get more available flow to the crank.

[blykins]

The purpose of the standpipes is to keep the oil off the cam/crankshaft.   The drain at the front of the block is open (oil drains to the timing set) and the drain at the rear of the block is open, which allows the oil to drain and stay off the rotating assembly.

On SBF's, the holes are in the center of the valley and are correctly sized for a 1/4" NPT.   Standpipes are sold OTC for such and you just run a tap through the holes.   On an FE, the holes are much larger, but you can still tap the hole and use a pipe nipple or hose barb.

[Yellow Truck]

The purpose of the standpipes is to keep the oil off the cam/crankshaft.   The drain at the front of the block is open (oil drains to the timing set) and the drain at the rear of the block is open, which allows the oil to drain and stay off the rotating assembly.

On SBF's, the holes are in the center of the valley and are correctly sized for a 1/4" NPT.   Standpipes are sold OTC for such and you just run a tap through the holes.   On an FE, the holes are much larger, but you can still tap the hole and use a pipe nipple or hose barb.

Brent and Jared, thanks for the explanations. Been a while since I had my engine open and I didn't remember the holes being there. What applications call for this treatment? Does a street engine benefit or just a race engine (not that I plan to dismantle mine to make the mods)?

[frnkeore]

As I said, he has blocked off the return hole on the right side, channeling the oil return, to the rear. giving a flow directly across the lifters on it's return path.

The left side flows forward, in the same way. Because of that, I see no reason to supply pressurized oil to the lifters with a solid roller cam. I don't know if he did but, I would then block the pressurized oil to the lifters, as it isn't needed and eliminates that oil bleed off.

[blykins]

Frank, the return hole is right in the front of the block.  You can see the timing set through the hole.

The oil will flow whichever way gravity makes it flow.  The dyno isn’t moving so you don’t have normal acceleration forces pushing it one way or the other.

The standpipes just insure the majority of the oil doesn’t drain onto the rotating assembly.  The oil will basically pool until it gets high enough to go out the front drain or the rear drain.