camarozz383

iTrader: (3)

hey guys, I have a 5.3 lmg carb swap, I went and got the LS2 valley tray, it dont have the little round gaskets on it, some people are using the gaskets and some are saying to block to lifter holes by tap and thread them and use bolts to block the holes? is there any reason to block the holes or use gaskets? here are a few pics to show what im talking about, thanks

LS1MCSS

iTrader: (18)

I blocked the holes in LS3 with plugs, like the second picture. If your valley cover is made for the o-rings, to block off the holes, just do it that way. Cheaper and easier.

camarozz383

iTrader: (3)

ok thanks, but I just dont see any reason for blocking the holes,we dont use when we do DOD delete, no oil goes down the holes after DOD right?

S10xGN

iTrader: (11)

Without the o-rings or plugs, you'll have 8 pretty good sized oil leaks and very little pressure...

camarozz383

iTrader: (3)

where would the oil leaks come from? oil can only run back down inside the engine? the holes were for pushing oil pressure on the dod lifters right? oil went down through not up right? with them gone and regular LS7 lifters replacing them and LS2 valley tray how would oil come up through the holes? thanks for the reply

S10xGN

iTrader: (11)

Run it w/o them and get back to us...

camarozz383

iTrader: (3)

lol I dont want to try it, I want the right answer, did you try it? or anyone else you know that tried it? thanks

Gray86hatch

iTrader: (83)

Plug them if the engine is not built. If it is together then run the correct gasket.

I have one both ways and the plugs are the way to go with the engine appart.

Tim

camarozz383

iTrader: (3)

hey thanks for the info tim

lotus7

Anyone have a link to the plugs

LS1MCSS

iTrader: (18)

1/8" allen head pipe plugs. Get them and a tap at the local hardware store or a bolt/fastener store.

lotus7

Thanks

Bo185

There are 2 distinct oil passages going to each cylinder deactivation lifter bore, one for the hydraulic lash-adjusting feature of the lifter, and one for controlling the locking pins used for cylinder deactivation.

The oil passages in the block supply oil pressure to the LOMA manifold. The solenoids provide the oil to the lifters to deactivate it using oil pressure. Hydro lifter function is supplied by another port.

So if they are left open it will cause an oil leak and loss of oil pressure same as if you left a plug out of the engine. The oil will flow to path of least resistance hence a loss of oil pressure which equals toasted bearings even if it's just ported back into the pan its still a leak. So either buy an LS3 valley cover with o-rings or a Vortec one. Or plug them.