JDM Engineering

Add tremendous power to your 5.4L Lightning or Harley! - JDM's ported heads are done on a 5 axis CNC machine - When time came to choosing a head porting design we sent four separate heads out to four of the best hand porters in the world - We then flow tested each one on a flow bench. After the flow testing we came up with our design off of bits and pieces of our hand porters design - We dyno tested the heads and came up with two more changes before our final design - 60 HP & 60 ft-lbs gain - Pre-Installed Camshafts - Valve Covers NOT included