These L92 heads have just great valves with the intake at 2.16 and the exhaust at 1.59 inches. They are so big that the rocker arms on the intake side have to be off center to operate. It also stopped me from going with roller rockers as they were really expensive($1400.00). They stock valve train has roller lifters and I added an upgrade to the pushrods by going to 3/8 from the 5/16. I head many stories of bend pushrods and I didn't want that to happen for just over $100.00 bucks.