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  #31 (permalink)  
Old 07-08-2009, 04:40 PM
How fast is fast enough?
 
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Quote:
Originally Posted by techinspector1
Using the twist method, I'd say that you definitely do not know how to adjust valves.

While holding the rocker tip down against the valve stem tip, jiggle the pushrod up and down and tighten the adjusting nut until all play is removed. Tighten the adjusting nut another 1/2 to 3/4 of a turn to set pre-load. Done.

Not to step on toes, but sometimes only 1/4 turn is needed, I usually only go 1/4 as I have seen 1/2 turn actually cause a valve to hang slightly open with a stock cam. But yea, use the "jiggle" method, not the "twist" method... Now that sounds scientific.

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  #32 (permalink)  
Old 07-08-2009, 05:21 PM
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Originally Posted by maliboo
I bought a set of scorpion roller rockers for my sbc street engine. When i was installing them i ran into something that i didnt expect, and had to screw the stock rockers back in.. The problem is that the bottom of the roller rocker body will collide with my heads, just where the stud is pressed in. Do i need different length pushrods or something? Or just grind some material off from head/rocker?


Cheers,

Maliboo
This is not an uncommon problem, especially when not replacing the press in studs as this leaves the rather high stock boss that is just enough to clear stock coined rockers. Also, the change to 1.6 typically requires that you correct the push rod length, which will fix the standing height of the rocker.

Bogie
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  #33 (permalink)  
Old 07-08-2009, 09:41 PM
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Your valvetrain geometry is what dictates push rod length. You need to get a solid lifter and an adjustable push rod. Check to see what length pushrod this combination is calling for. There are too many variables to just assume anything.

As mentioned you also need to check push rod slot clearance and if they need to be opned up, the heads are going to have to come off anyway. Save up a little coin to get screw in studs and be done with it. Down the line you will want more power and a bigger cam, that's just the way it works.

The problem could very well be that the rockers are just too thick for the room you have.
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