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Message: <blockquote data-quote="96blak54" data-source="post: 1490533" data-attributes="member: 14727">The modulars have limited aftermarket head options. Trickflow makes a $2000 set of improved design 2valve head and there are a host of 4valve head package options from ford.And then there is the big 5.4l engine swap option, 2v or 4v,  that will gain you zero hp over what the 4.6l can do, however does bring monsterous torque that does nothing for a quicker car. Valve size restricts any hp gain and either engine size maxes out what the intake valve can allow to pass through. Trust me when i state the 4.6l is a powerful platform.Keep in mind, any direction will require ingenuity especially a 5.4l swap. The 4v package swap is a bit more straight forward long as all the components of the package are available.My suggestion for simplicity sake, find another 4.6l from a '04-up crownvic/mercury/ lincoln and swap it in. These model year engines came with the most up to date improvements and will add to the success of your swap.If you want to become your own worst enemy with thoughts of power improvements, cracking the engine open will be necessary. Sure there are fun bolt on improvements and they help, but its nothing spectacular. Swapping the cams is where its at, but be prepared for a learning curve.Deviating from a stock engine setup really screws with the fuel injection programming that will need to be dyno tuned. Its an added cost and brings on vehicle downtime if your are willing.</blockquote>