Trick Flow 6-Bolt LS3 255cc GenX Aluminum Cylinder Head LSX 255. 650 Lift Ti Ret. This product data sheet is originally written in English. These are the TFS GenX LS3 255cc intake runner aluminum heads with 6-bolt pattern for aftermarket blocks, 69cc chambers, titanium retainers. And a max lift of. 650 for hydraulic roller camshafts. Looking for serious LS3 horsepower? Trick Flow engineers combined the best features of factory GM LS3 and LS7 cylinder heads with Trick Flow's own unique brand of race-winning engineering and technology to create the ultimate square port LS cylinder head for 4.000 and larger bore engines-the GenX® 255. The heads feature fully CNC Competition Ported…