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Thanks for the advice. I thought these heads were a bolt on and go? It sounds like alot of swapping parts that are already assembled on the head. I don't like the idea of swapping the locks, retainers and springs to fit in an XE274 cam which isn't much bigger than the stock one, it seems for $1000 these heads should be able to support that right out of the box. So far the vibe I get is these heads are junk.



That cam isn't even over 500 lift IIRC. All the stuff on those heads will handle that cam easily. As with any aftermarket head you should have them checked. By the way my machinist checked mine over and was very impressed (changed nothing).

Last edited by ireland383; 02/02/11 08:29 AM.