There is a really good thread on specmiata.com where a guy tore down I think a Rebello SM motor, a Sunbelt Motor and a Race Engineering motor.

Just blatantly illegal stuff in some of them (I can't remember which ones). Blatantly.

I think Jake and Andy nailed the legality issue on cam blueprinting. Making it match the best factory specs? Fine. Any other fudging? Not fine.

Ron ran into this with the oddball C cam for the Z car. It's hard to even find a SINGLE C cam, much less a good one. So, you have one cut, but you do it right.