Solid Hydraulic Roller 4.125 " Bore LS7 Heads suit OEM style Rocker Gear. Chamber Softening:No 375” will accept factory headers

375” will accept factory headers

180" valve

5" deck block

The JK400 cylinder head is a creation from Jon Kaase

Solid Hydraulic Roller 4.125 " Bore LS7 Heads suit OEM style Rocker Gear. Chamber Softening:No 375” will accept factory headersCID LS7 4. 125" Bore Hydraulic Roller cylinder heads feature factory valve locations that accept OEM or aftermarket OEM Replacement Valvetrain Rocker Gear. Valve lengths for our hydraulic cylinder heads measure 5. 550" OAL. Rocker arm pedestals are machined into our shaft mount rocker pad area, making them extremely rigid with the rocker bolts engaging deep into shaft mount pad that extends down to and is integral with the deck. Machined from the same