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Hi guys. I just picked up a rebuilt 1997 mark vi vortec 454 .030. The engine was done to stock specs. The guy I got it from started a project and abandoned it so I got the complete long block for a great price. Everything was rebuilt/replaced on the engine. These run about 9:1 stock compression and I'm assuming that it's going to be right around there give or take .3. I have a question. I'm going to be upgrading the cam before I get further into the project. What is the largest cam that the vortec heads can handle without machining the valve guides for seal to retainer clearance?