I want to know how your PTV clearance is with the LQ4 shortblock and a moderate cam. I have the opportunity to get a set of AFR 1660 small bore 225cc heads for a good price and would like to bolt them onto my 6.0L. I'm concerned that PTV is going to be too tight and flycutting the pistons isn't an option. My pistons now are .013" out of the hole - I'll be using a .052" MLS GM gasket and I know the free drop on the AFR head in question is .114". My camshaft from Ed Curtis is a 224/228 .612/.612 112LSA +4. Would the cam timing need to be pulled back a couple of degrees? Also, does anyone know the depth of the dish in the LQ4 pistons? Will these babies be a slap on 'n' go deal or should I look for something else? The price is too good on these to not walk away from so I'm hoping they'd work out for my setup. Any experienced people, please let me know your findings.