This is one of two customers that wanted to use smaller head gaskets. On both of those heads they flowed some nice numbers but they both had some mid lift flow turbulence. When you gets these heads nicely up over 300 cfm the bigger chamber is needed. I will not take on any more work from guys desiring to run smaller head gaskets unless it’s with a 2.02 valve. I put in 1/3 more work for zero payout. Not going to happen again.