LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Scorpion rockers problem

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Old 01-31-2012, 10:49 AM
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Originally Posted by SPOOOOLIN
I just realized that I measured pushrod length BEFORE the damn guide plates.... ****!!!
You really need to read up on valvetrain geometry if you think adding guideplates will affect pushrod length.
Old 01-31-2012, 11:10 AM
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Stock lifters. And what is this tapered stud your talking about.
Old 01-31-2012, 11:41 AM
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I can't tell, but it appears the studs you have are flat style like this:

That allows the rocker body to bottom out onto the stud. If not fixed it will cause serious damage to your valvetrain.

You need tapered studs. You'll notice there is a shoulder. That allows the rocker to sit higher to clear the bottom of the stud:


Get them and recheck your PR length.
Old 01-31-2012, 01:34 PM
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Originally Posted by SS RRR
I can't tell, but it appears the studs you have are flat style like this:

That allows the rocker body to bottom out onto the stud. If not fixed it will cause serious damage to your valvetrain.

You need tapered studs. You'll notice there is a shoulder. That allows the rocker to sit higher to clear the bottom of the stud:


Get them and recheck your PR length.
That was the point is was making also . If your running stock studs they will cause this problem on rockers , It happen to mine
Old 02-01-2012, 09:37 PM
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Have a 2nd set of eyes help you out. You may have more than 1 issue

Last edited by 94FBIRD; 02-01-2012 at 09:40 PM. Reason: Different thought
Old 02-03-2012, 06:57 AM
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Originally Posted by speed_demon24
You really need to read up on valvetrain geometry if you think adding guideplates will affect pushrod length.
True, but adding guideplates to an engine that doesn't require them, and combining them with OE rocker studs, will move the shank of the stud approximately 0.060" closer to the bottom of the rocker arm. This could cause a clearence problem, even if the pushrod length was correct.
Old 02-03-2012, 11:46 AM
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I've had scorpions touch with tapered studs, when a pushrod for bent (effectively making it too short).

I would bet its a pushrod issue, but its just another reason I don't care for scorpions...



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