All 4.6 engines essentially use the same size blocks (2v, 3v, and 4v) but that's where the similarity stops. Rotating assemblies are different with different compressions, combustion chambers have different clearances, all kinds of stuff. Your cheapest option for big power and 4v heads would likely be finding a low mileage wrecked GT500 with a 5.4 4v and throwing it in with the blower and TR-6060. I'm going to build a Brenspeed 326 CI stroker using a 5.0 BOSS block (not coyote), 3v heads, stage 2 cams, and either a Roush TVS 2300 or twin turbo setup with a Tremec Magnum XL. It won't be cheap, but it'll be cheaper than a 3v to 4v 4.6 conversion that'd produce half the power.
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more!