FastKat

iTrader: (10)

Haha I don't think Phil's afraid of a little engine speed!

bulletLS1

I did my drilling also, no mishaps, but the lower part of the trays where full of gunk, thick, black soothy, (I use good quality oil) and the trays where very difficult to clean also the flashing from the plastic must be cleaned, deburred and all sharp edges cleaned with dowel and sandpaper, and be REALLY shure not a small spaec of plastic CAN fell to the oil::::

eallanboggs

iTrader: (1)

Do you drill both sides of the retainers? If you only drill one side do the holes you drill go toward the valley side or to the outside or does it even matter?

Dixit

iTrader: (1)

Drill on both sides

Teutonic Speedracer

iTrader: (20)

I understand that you only drill out one side, and the postion is important too. Are you guys drilling out the LS2 lifter trays also. I have some on the way and understand they are beefier and fit the LS1.

427

iTrader: (3)

We normally just drill one side. We face the holes toward the piston side, so the oil will run out of the retainer back to the pan.


Kurt

bulletLS1

OOOOPS! two sided hole!

98LSZ28

iTrader: (2)

any dimensions on where to place the hole? ie: distance from top of tray and off centerline?
Thanks!

bjamick

iTrader: (31)

I would guess just make sure the holes are even and it prob wouldn't really matter as long as its somewhat centered.

405HP_Z06

iTrader: (11)

Here is what I did. I posted a thread on this subject a short while back.
See: https://ls1tech.com/forums/generation-iii-internal-engine/848915-lifter-retainer-modification.html

Measurements: Note: I only drilled one side, the background makes it look like I did both sides.

98LSZ28

iTrader: (2)

Thanks! Gonna do mine tomorrow! need all the oil flow I can get!

TransAmcoupe98

iTrader: (10)

I did the drill in my retainers, supports quicker drainage out. I put 2 in each side.

radkon

iTrader: (2)

I won't say don't do it but I will state that this "mod" is intended to prevent oil starvation in "sustained high RPM" engines. In esscence you are allowing oil to drain out of the lifters and return to the pan faster. If you are tracking the car every once in awhile toss an extra half quart of oil in the pan and call it a day. Me, I prefer to have my lifters well oiled.

Just my $.02, which like anything based on the dollar anymore isn't worth much

flynlow3

iTrader: (2)

I did. I read it as well in the how to build a high performance ls1 book and chose to do it while i was in there. Cant hurt right?

fastvet

iTrader: (2)

I'm about to do it today, If I **** up, then I will be leaning towards you all for spares! HAHA!

405HP_Z06

iTrader: (11)

As long as you use a Unibit, it will be fine. If you use a 1/2" drill bit, all bets are off.

jsteele90

iTrader: (13)

little extra oil never hurt anyone!

DrkPhx

iTrader: (15)

I used masking tape on the surface of the tray and used a 1/8" drill to start. Then went right to a 1/2" bit with no problems or cracking.

ibjamin

iTrader: (6)

I'm doing this today.

Just a heads up> Those dimensions shown on the photo ARE NOT CORRECT!!! Don't use the 1 5/16" dimension shown. The actual measurement should be about 11/16" for what is shown. The 1/2" dimension is correct.

George

405HP_Z06

iTrader: (11)

Thanks George, I made a note and misread my handwriting. I corrected the image.