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Discussion Starter · #1 ·
don,t forget as many guys do, that swapping to a higher ratio rocker changes the push-rod rocker geometry,and clearances, and may require a different length push-rods.






http://forum.grumpysperformance.com/viewtopic.php?f=52&t=181

http://forum.grumpysperformance.com/viewtopic.php?f=52&t=282

http://forum.grumpysperformance.com/viewtopic.php?f=44&t=2839&p=7344&hilit=adjustable+guide#p7344

http://forum.grumpysperformance.com/viewtopic.php?f=52&t=126&hilit=louis+rocker


and you may need too use the correct adjustable guide plates when you find the push-rod alignment is in need of minor tweaking to get the clearance and geometry correct





using a louis tool, this tool is a GUIDE /tool for use with a high quality DRILL,its made of HARDENED STEEL that FORCES the DRILL BIT to drill thru the head to correctly lengthen the push-rod slot for increased clearance, they usually come WITH INSTRUCTIONS AND THE NECESSARY DRILL
 

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8,547 Posts
Discussion Starter · #3 ·
What amount of additional clearance is typically required?

the heads and rockers used obviously effect that answer but you'll usually want at least 60 thousands clearance on the push rods to slot measurements and you'll want to rotate the engine thru two complete revolutions while verifying that clearance, while watching the push-rod geometry as it changes as the rockers move thru their arcs
 
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