The home of New & Used Engine Parts. Parts Stored Inside and Out of Weather. ETP's 364 Cylinder Head Suites GM LS Square Port. Suits the 364 Casting Cylinder Heads. Intake Valve Head Diameter. Exhaust Valve Head Diameter. There is NO requirement for you to send us your old head or parts. A little about us. We setup our Shanghai operations in 2004 for the purpose of controlling the quality of our parts as they are being manufactured. This quality gateway has been very successful and a huge benefit to our customers by allowing us to offer great quality parts at very competitive prices. It is recommended to have your…