I have a ls2 block for my new build up. what I need to know is how to block the dod holes???

 

Drill and tap for 1/8 NPT pipe thread allen plugs

 

whats a dod hole i cant firgure it out

 

Does ls2 block have dod capability ?

 

 

The orings on the valley cover seal them off.

 

no need to do anything, like stated above, the valley cover has gaskets that sit over all of those points, they are plugged for all intensive purposes from GM.

 

So, if I have the LS2 valley cover then I won't have to plug the holes? So the options when putting an LS2 into an LS1 car are either to tap and plug the holes, or just buy the valley cover?

We really need an FAQ for LS1 --> LS2 conversions. I am actually keeping track of this stuff, and I will post it when it resembles completeness.

-Geoff

 

You need the valley cover anyways, just buyit and be done with it

Dave

 

right, the valley cover is needed as I do believe it's differnent. The cover will take care of the issue, so get it and you're all set.


I was curious about this same thing myself after seeing someone did drill and tap the block... but after talking to my builder, it's not nessassary.

 

The LS1 valley cover will not fit on an LS2. Also make sure the LS2 valley cover has the o-ring gaskets to seal off the displacement on demand ports when it is installed.

 

It's easier to tap them and install a plug, that area is going to see 60psi+ so why would you not do that?

Bret

 

because the seals will be enough, why do the extra work for nothing? Even if some seepage were to get by at that point, it's not going out of the motor, it's runnign right into the valley and back into the crankcase.


Eastside's built a ton of ls2 based motors, and hasn't done that to a single one, and none of them are having any issues... GM put the seals on the valley cover, that being said, I think they probably know what they are doing. If they thought that was inadequate, the blocks would be tapped and a plug bolt would be supplied.

 

Well it scares me to think that tapping a few holes and putting a plug in them is extra work for a engine builder.

 

because it is a waste of time, way spend time doing something that will net you zero gain?

I mean people can polish the top of their heads so they look really neat when the valve covers are off, but at the end of the day, it's a waste of time, no gain will be netted by doing it. Same thing as drilling, tapping and plugging holes that are covered by the valley cover and a rubber seal.

I can think of alot more important things to focus on in an engine other then tapping and plugging a hole that the factory already seals with a gasket.

you being an engine guru, I'd hope you could to.

 

Can someone explain the purpose of the DOD holes?

 

The purpose is to supply pressurized oil to the lifters for the solenoids to activate or deactivate the lifters.I believe if u dont plug them and they leak u might lose oil pressure.

 

Exactly.... it's better to plug them and then setup the motor to run on the least amount of oil pressure that it needs. It might be me, but when I spend 6 hours making a crank scraper as a normal practice, taking 20 mins to run a tap and a set screw in a hole to make sure something works perfect is not a problem to me. Maybe that's just me though.

 

Here is a pick of what they supplied oil to on my L92. The stock valley pan is the crazy thing with with the orange o-ring. W2W put a reg plate on it. I can't say if they plugged them or just used the valley pan that pluges them.

 

I'll bet that w2w just used the valley cover. Ken at Eastside who's building my motor talks to kurt and several other people that are at the leading edge of the ls1 world, and if he tells me its' not needed, then it's not needed. I am not one to question his knowledge or ability, and neither are most people for that matter... I trust what the man says, if he says it's not needed, it's not needed.