Is there a Billet Cam Chain Tensioner spec?

There is no actual answer to that question except for as much pressure as needed to prevent the chain from jumping the sprockets, but not too tight as to wear out the guides. (There are no xx ft-lbs. etc.)

Here are the instructions from an actual race manual from Suzuki Japan:

Camshaft Chain Tensioner

• Replace the cam chain tensioner with the kit tensioner to decrease the flutter of the tensioner.
• Apply the engine oil to the tensioner rod, O-ring, and tensioner body, insert them into the
  tensioner body. (Our Brock's Performance tensioner is pre-lubed)
• Check to see that the tensioner rod turns freely in the body.
• Install the tensioner on the cylinder block with the tensioner rod fully pushed back.
• Turn the tensioner rod in with a screwdriver until it becomes hard to turn.
• Turn the crankshaft clockwise (forcing lightly) to the tensioner rod (with twisting force) to
  take up any gap, and tighten the locknut.

NOTICE
Never forward the tensioner rod forcibly, this will increase the mechanical loss of the tensioner and may damage the chain guide. The cam chain tensioner must be adjusted at every race when road racing.

For drag racing, we check it frequently every 10 passes, by rotating the engine by hand forward and back to feel for excessive movement. Minimal 'slack' may be felt, but excessive slack can cause the chain to jump timing and lead to engine failure.