Jeff...you need heads with a 1.90 inch intake valve UNLESS you plan on notching the piston. I called AFR about the 185 heads with the 2.02 valves, they said it was a 80% chance they'd fit OK...but I wasn't about to take a chance. The 165's bolt on...or if you REALLY want some breathing...contact ATI for some AFR 165 heads. The're pricey..$1800 new...but flow fantastic. dino