Read the article about block mods for racing. There is a section describing drilling 1/2 inch holes between the lifter bores and installing 'stand-offs' to aid in lifter oiling. Where can someone get these stand-offs and how tall are they?

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-MattMan
LEANED & MEAN

When my machine shop does this process he uses valve guides and they are about 1/2 high .... eyeball measurement.



I'm sure doc Will chime in.



Greg

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http://www.youtube.com/hyperpack

We used these in hundreds of circle track engines and we just used short brass pipe nipples.

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There's no such thing as too much cam....only not enough engine!

The main goal with this mod is to get more oil around each lifter so more oil drops down around the lifter & onto the cam / lifter surface, for better lubrication / cooling at the lifter to cam interface point.
Drilling the extra holes just helps crankcase ventilation.

You can use whatever... to make the stand-offs but these days, I don't use stand-offs much.
Instead, I have a large multi-flute 1 inch diameter countersink, with a long shank and I use that to put a large 45 degree countersunk "ring" around the top of each lifter bore.
The added recesses catch and directs more oil thru all the lifter bores.

Note: I always have to re-ream & hone out each lifter bore, after countersinking, to remove the burr the countersink creates. ( you want to hone the bores anyway, just to be sure they are smooth and have the proper oil clearance... just be sure do it
after the countersinking operation)
DD

OK. That pretty much answers my question. I honestly didn't see the need for the stand offs since the engine has a 30* tilt.
Thanks.

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-MattMan
LEANED & MEAN

If you need more oil directly to the face of the cam shaft lobe, you can use a tool like comp cam has, that will score a line when drawn up the lifter bore allowing a dribble of oil on the face...

I hone the lifter bores quite a bit on the race engine.

No problems.

I have not done the countersink trick, but It's a good idea and will be doing it on future builds.

Greg

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http://www.youtube.com/hyperpack

How much do you countersink it?

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

I shoot for .060 with a 45 degree c-sink. (90 degree "included" angle)

The factory already did a rough countersink so some of the bores are easy to "touch-up" but others take a bigger cut and more work.
DD