Old john definitely knows a thing or two about porting cylinder heads ect... I have one of his heads on my car i just dyno'd 630awhp, vp109, 2530's 26psi with more to go.. Surprising thing is this was done with a standard ignition module in place and plugs gapped to .8mm.. Read about alot of people having trouble with ignition break down at around 400rwkw then having to add DLI and gapping down.. I guess when the heads done right its not so hard to get the whole combustion process going.. But again fantasic results it must be a awesome car to drive..... Ryan