Re: Cylinder heads
You'll be ok, just check the head bolt torque 2-3 times after a few heating and cooling cycles each time. A lot of people just bolt them on, torque them down and never check them again.
Sometimes you get away with that and sometimes you don't.
One question you might ask them is how thick the decks are?
5/8" thick or better is needed for any power adder applications due to the increased cylinder pressures.