Trickflow GenX LS7 CNC Ported Bare Cylinder Head Casting With Seats 260cc Intake. This product data sheet is originally written in English. These are the TFS GenX 260cc intake runner aluminum heads with 70cc chambers. Looking for serious LS horsepower? Trick Flow’s GenX 260 square port aluminum cylinder heads for GM LS7 are designed to meet the needs of enthusiasts using any LS-based engine block with a minimum bore diameter of 4.100. To improve the factory design, Trick Flow added more material to the A356-T61 aluminum castings for increased rigidity and strength. Then Trick Flow improved the valvetrain system by integrating modular one-piece, 2024-T4 billet aluminum rocker arm mounts that are removable for high-end shaft rocker setups. Trick Flow’s high flow, high velocity CNC Competition Ported runners with the premium high resolution surface finish provide all-out air flow and performance throughout the entire powerband. Other major improvements include the available 6-bolt per cylinder clamping for GMPP LSX and other aftermarket blocks, clearance for 3/8 pushrods, through-deck coolant holes to fit all GM LS gasket and block combinations. Trick Flow GenX 260 square port cylinder heads for GM LS7 work with all LS7-style intake manifolds. The heads maintain the factory intake and exhaust port locations, valve angles, and valve locations so they work with existing LS7-based pistons. Exhaust Valves Included: No Exhaust Valve Diameter (in): 1.600 in. Notes: These cylinder heads are not designed as a stock replacement, they can only be used on 6 bolt LSX-based engines with a minimum bore diameter of 4.100 in. This cylinder head does not include rocker arm rail mounts. We do not lower invoice values since it is a violation of US and International custom laws. Let us work to resolve your problem so everyone is happy. Suite D7 Costa Mesa, CA 92627. And no repairs will be provided, nor labor charges covered by TREperformance Inc. Price Listed is PER HEAD.