im trying to find where to get these little babies. Dont know exactly what they are called. they are .5' and are supposed to have a certian size hole for oil to pass through to the timing chain.... or so i read on a few post a long time ago. I cant really find it in the old post. Probably just looking over it

 

Gm Part # 10110897

 

If you get aftermarket plugs that aren't drilled, you can drill them yourself. The hole should be 0.030", but when I did it I used a #70 drill bit which is 0.028" and probably close enough.

Chris

 

Thanks fellas!

 

Back from the dead.


WHich plug do you drill, does it matter?




David

 

Back from the dead again, David did you ever figure out which one is suposed to be drill? I just looked at mine and none of them are drilled, I'm really regreting my engine builder, shouldn't he have done this for me?
-b

 

Make him do it.

 

It's already in the car, the guy didn't clean the paint off the cam (which could of cloged up all kinds of stuff), or even clearance the valvecovers for the promags, or hit the compression ratio I wanted, didn't have the machine shop zero deck the block now my quench is a little on the high side, I just flat out don't trust him and would rather do it myself.
-b

 

The more stuff I check the more upset I get. But at least I'm checking, and it will be perfect one day....
-b

 

Holes go in the two outside ones, not the middle one. Buy an extra bit while you are there. I drilled mine (threaded plugs) off the car - some do it on the car, but I would be afraid of breaking a bit and getting it or shavings in the motor.

 

I used a 1/64 bit now I am thinking mine are to big might have to buy some new ones.

 

1/64"? 1 / 64 = 0.015625. Too small, not too big.

Folks say .030, but the .028 bit wouldn't even fit in my stock ones, so IMO even drilling .028 is increasing it slightly. I did .028.

 

Lt-1's use these oils to add a little extra oiling to the top of the timing set to help lubricate the water pump gear. A lot of rebuilds don't include the oil holes and noboby seems to be incuring any problems from the lack of a little extra oiling. If the motor is apart it certainly won't hurt anything to drill a .020" - .030" hole in each of the side plugs. I would also have to presume that they get pluged over time with sludge on some of the high mileage motors when oil changes are neglected.

 

Hmm..interesting. Thanks for the info guys I apreciate it.
-b

 

The way I determined the 0.028' was by trying different drill bits from my #61-80 drill bit set until I got to one that fit snugly in the holes; that turned out to be #70 which is 0.028".