OEM Yamaha Cylinder Head - In Stock Ready to Ship Same Day -CNC Ported and Hand Finished -Hand Blended Chamber -Newen CNC Valve Job (Both Exhaust and Intake) -Moldstar Intake Valve Seats -Moldstar Intake Valve Guides -Epoxied Intake Port -Port Matched and Installed Intake Spigot Porting is an SX/MX style port and are not huge ports. The valve seats are cut on a state-of-the-art Newen CNC machine for custom seat profiles and perfect concentricity that improves performance, valve and seat life. The intake seats and guides are replaced mostly for durability with a small benefit in performance due to improved heat transfer from the intake valve. The intake seats and guides have a common failure method of chipping and cracking; this head setup eliminates that risk. Disclaimer: You will receive either a brand-new head that was removed from OEM packaging or a head which was removed from a brand-new engine with 0-1 hours. If you require an absolutely new head from OEM packaging, then please message us and we will be sure to confirm what we have available before you purchase! Do not complain or leave us a bad review after you order if you did not read this description, you are not obligated to purchase anything. We do NOT do returns on heads that have been installed or had any type of valve bits installed. You touch it with more than your fingertips you own it. This ensures every customer gets the product we have listed here.