07-23-2007, 06:04 PM
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CC Member
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Join Date: Jun 2003
Location: Freedomia,,
Il
Cobra Make, Engine: Coupe,Blue w/white stripes SB; Roadster, Blue w/white stripes BB w/2-4s; SPF installer/Hot Rod-Custom Car builder
Posts: 1,376
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Everyone has given some suggestions, so what the he!!. I did like the comments about tight guides, but don't think that's it....it would get worse quickly instead of better and likely bend pushrods each time it was cranked. I would check a few things, first is lifter pre-load, because of the pump up issue already mentioned and then spring bind or keeper guide interference. If either of these 2 are close and the lifter pumps up because of poor pre-load settings it would create a bent a pushrod everytime. Head/valve machining will reduce preload and needs to be reset. Since the rockers are non adjustable there are 2 ways to correct it. The first is the old factory way with shorter/longer pushrods or the newer(far better IMO) shims. With the guide height and the hard valve stem seals it takes little to bend a pushrod when bind occurs...the leverage is in favor of the valve end not the pushrod.
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