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Chevrolet LS3 250cc 57cc New Assembled Aluminum Cylinder Heads One Pair (2) of heads New springs retainers and valve locks. Holds .650 lift camshaft Intake CC - 250cc Exhaust CC - 82cc Combustion CC - 57cc Angle Plug Intake Valve Size - 2.16 Stainless Steel performance Exhaust Valve Size - 1.59 Stainless Steel performance The cylinder head included in this listing will fit the vehicles listed below. It is also important to review / confirm the fitment notes above to assure the vehicle specifics of the head are correct for your application. If you have any question that this may not be the correct head for your vehicle or need help in locating the correct head, please contact us via phone or email prior to making a purchase.