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I have read a few places lately that it's possible to change the camshaft on an LS engine without pulling the heads. One article mentioned some kind of dowel like there was a way designed into the engine to hold the lifters up. I'm all for a camshaft change but going as deep as to pull the cylinder heads off and replacing headbolts etc on a new engine is further then I'm willing to go.
 

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What I should have pointed out, though, was that the issues of degreeing the cam and/or checking P-V clearance are totally separate from whether it is neccessary to yank the heads. The LS engines feature "lifter trays" that are designed to let you to remove springs & rods, slowly spin the cam & "park" the lifters, thereby allowing the cam to be slid out & a different one slid in. The trays are not 100% reliable, however, especially on worn engines, so there are cam install tools that builders use to help get the lifters out of the way. Here's an example:

http://www.thunderracing.com/catalog/?action=shop&sid=108&pcid=171
 
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