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Old 02-24-2009, 07:23 PM
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BBC Rocker alignment

I'm running 049 heads with Comp Magnum rockers. I need to adjust rocker alignment. Is there any reason why I can't split the guide plates, adjust them, and TIG them back together while bolted to the head? If so, should I align them closed, at mid lift, or opened?

Thanks,
Kevin

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Old 02-25-2009, 04:55 AM
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There should be enough play in the holes of the guide plates vs stud diameter to have some adjustment. I would think you could also elongate the holes to give you more adjustment without a whole bunch of cutting and welding. The guide plates come the way they do for a reason....maybe something else is amiss if you have to go that far to get yours lined up.
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Old 02-25-2009, 05:10 AM
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guide plates

I cut and tig guide plates all the time. I even have a fixture to weld them off the head.


Keith
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Old 02-25-2009, 09:05 AM
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Dont want to hijack the thread just curious. How is it that the configuration of the guide plate could be far enough off that they need to be moved that much?
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Old 02-25-2009, 09:28 AM
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alignment

There are a few factors that come into play.

If you were to measure the center to center distance of the lifter bores, the rocker stud holes, the valve stems, etc. you will soon find out that they are all a different distance.

Then start adding the difference in guide plates and you will soon see how they can be off a mile.

That mess is hidden with stock rockers, but soon as you add a nice machined wheel sitting on top of the stem and not hanging down over it, you can see the problem, if you’re paying attention during assembly.

I just spent 4 hours making 8 guide plates for a set of GT-40 heads. They were really bad, coupled with the rockers I was using there was no room for any type of adjustments.

Keith
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Old 02-25-2009, 09:37 AM
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rockers

To clarify for those playing along at home.

I am talking about the roller tip alignment front to back on the valve stem. NOT pushrod geometry, which moves the roller in the intake/exhaust placement direction.


Keith
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Old 02-25-2009, 10:21 AM
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Isky makes a really nice adjustable guide plate for small blocks. Someone should come up with one for the Big Block.
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