Thanks techinspector1! Like I said its really amateur racing. I’ve been winning races with a 20 year old 350 thats now down to 110 psi. I was leaning toward closed but was always hearing that 781 and 049 were the dream heads. Im on a poor mans bugdet so changing pistons is out of the question. Im looking for completely rebuilt or recently rebuilt heads. What about the 063? I saw a pair of those for sale. Thanks