Reworking the 273 Adjustable Rockers

krazykuda said

So the access hole is there from the factory and you are just plugging it?

Yes

Does it matter, I wouldn't think that it would leak too much oil if any...

I would be worried that if I put the screw in too deep, it would interfere with the adjusting screw.... :violent1: :banghead:

Click to expand...

It does matter once you get past 6000 rpm because the oil wants to shoot straight out instead of turning down to the cup. The oil coming out of the top is going up to the top of the valve cover stead of flowing down on top of the valve. That's why racers cook the tips and adjuster ball, they are not getting the oil they did at 4500.

As for the screw hitting the adjuster not a problem. If you have the adjuster in the rocker and screw the screw in the hole untill it hits you then turn the adjuster and it will cut grooves in the tip of the plug. This will also keep it from turning back out.

When you tap the hole you only put 4 or 5 threads in it that way you are forcing the screw into the unthreaded part and the resistance helps to lock it in place.

As for the hole in the top you drill it 3/4s of the way through. Tap it 3 or 4 threads then screw the plug in untill it twist in two. A little loc tite on the threads doesn't hurt either.