Valve Train Geometry

[Gelf VXR]

Anyone no of a schematic for the LS3 head? Is the rocker arm a sweep C pattern, in that the rocker fulcrum in perpendicular to the inlet valve at mid lift? Ie minimal swipe pattern

I see a lot of forum posts dying that it should start on the inlet side and sweep to the exhaust?

Correct shimming on the pedestal should produce a C swipe providing the greatest lift potential and minimum lateral stress on the valve guide, this sounds most logical to me.

By C I mean as in the arc to produce to and fro movement.

Edited by Gelf VXR on Friday 18th July 05:17

[Gelf VXR]

Yes, seen this, my question is the swipe pattern in one direction or a to and fro motion on the LS head

[Gelf VXR]

I think so

[Gelf VXR]

I'd rather see a schematic than believe a thing mr google has to offer lol

[Gelf VXR]

Here an article the covers what I'm trying to determine



http://www.aera.org/ep/downloads/ep10/EP04-2010_20...

[Gelf VXR]

Finally an answer from google I'm content with, a post from Brian Tooley

http://ls1tech.com/forums/generation-iv-internal-e...


Stock rockers are designed to work in a "half arc" meaning that if you visualize the motion of the rocker tip, it works in the first half of an arc. As lift increases past .600" lift the rocker tip starts arcing back towards the intake side of the valve. For roller rockers this is very desirable, it makes the contact patch more narrow. But for stock rockers it's a disaster because the rocker simply spends more of it's cycle dragging across the valve tip. So shimming up roller rockers makes sense. Shimming up stock rockers is one of the worst things you can do for durability.

Pushrod length on a bolt down LS head has zero effect on rocker geometry.