I've been on the dyno plenty. Everthing from an iron head 292ci 273 that made 472hp to a 482 pontiac that made 982 to every kind of BBM wedge and hemi. My current pump gas street hemi made 740hp on 93octane and 1050 on the juice. Have a 540 twin turbo all aluminum hemi that'll be on there soon. Anytime you wish to compare accomplishments, dial me up. On a throw together stock 318 that's never going to see the high side of 5000 rpm, you have to be fooling yourself to think it's going to justify itself or make an additional 5hp. . If it was a 416 stroker, sure. This is a wasted effort in this piece.