AFR 15° LS1 Mongoose Head, 210cc, Set/2

AFR’s Mongoose LS1 Heads are emission legal (CARB #D-250-4) 210cc LSX heads are the cost effective performance choice over re-worked factory heads. They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, Titanium retainers and high quality components throughout. Recommended for street, towing, or street/strip engines with displacements up to 383 cubic inches, operating up to 6300 RPM. Requires minimum 3.900” bore size for intake valve clearance

Stock GM Rocker Arms - GM Rocker Arms are not designed/engineered to accommodate aftermarket cams or higher spring pressures. At a minimum AFR recommends using Bushing Trunion Kit. Other available options are aftermarket kits from Yella Terra, Scorpion,or Comp Cams. Without the proper parts you will experience accelerated guide wear.


Boosted/Nitrous Applications - We strongly recommend considering Inconel exhaust valves and AFR's optional heavy duty intake valve for power adder applications. Since boosted or nitrous oxide applications accelerate RPM quickly, additional spring pressure is required. We strongly recommend upgrading your valve springs or increasing your valve spring pressures since boost pressure on the valve reduces spring tension. For example, 15lbs boost on a 2.125 OD valve reduces the springs closed seat pressure by approximately 40-45lbs.