Roller rocker adjustment?

[simonjrwinter]

I'm just putting the finishing touches to my 331 stroker build, I have installed my correct length hardened pushrods, and need to know how to adjust my rockers.
They are scorpion 1.6 roller rockers. do they need a gap between tip and valve stem or do I tighten them, then nip them another 1/4th turn?
Any advice gratefully received.
Thanks

Simon

[Wade Chamberlain]

hydraulic or solid lifters?

[simonjrwinter]

Sorry, should've said....hydraulic

[Wade Chamberlain]

typically it should be about 1/2-3/4 turn beyond zero lash. If you have stud mounted rockers, lock 'em down and you're set.

If you have pedestal mount, they should torque up within 1/2-1 turns beyond zero lash. If they don't torque up, you need longer pushrods. If they torque up too soon, you'll need to shim under the pedestal.

EDIT - I should have mentioned that the adjusting should be done while that particular lifter is on the base circle of the cam (i.e. when the cylinder is at TDC on compression)

[trularin]

Wade is correct, I use a bump switch to turn the engine to the desired timing location as I adjust.

I use a finger spin on the rod to tell me the rocker is at zero lash.

I do not add anything to the setting. I just leave it at the top and lock it down.

Note: if you do not prelube your engine before you do this, you can be adjusting all day. Get a good pressure reading before you set your hydraulics. This keeps the cups from giving as you adjust.

Just my $0.02