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Product: **Aluminum Jeep Cylinder Head #HESACH Price: $1,995.00 Description: This is the only aluminum Jeep head now available in the U.S and made in the U.S. for the 4.0L & 4.2L Jeep engine.  Benefits include:           -  CARB REGISTERED.  EO #D-592.           -  Made in USA by HESCO           -  Virgin 356 Aluminum T-6 heat treated           -  Hardened seats & silicon bronze guides           -  Direct bolt-on replacement for stock head           -  Fits 1991 - 2007 4.0L engines           -  Fits all 4.2L engines using 4.0L Intake / Exhaust            -  30-pounds lighter than stock cast iron head           -  5/8" thick deck for increased strength           -  30 HP gain on 4.0L - 50 HP gain on 4.2L            -  Lowers CHT & combustion chamber temps           -  Reduces detonation from low octane fuels           -  Improves NOX emmissions           -  Includes performance valve springs           -  Rocker bosses will accept stock or roller rockers           -  Extra thick runners for porting up to 0.250"           -  Extra metal under the springs for oversize springs           -  Raised V/C mating surface accomodates rollers           -  Enlarged push rod holes simplify cam changes           -  All accessory bolt holes (Incl coilpack holddowns)           -  Serial Number stamped on each head               MADE IN USA by HESCO.  CARB EO #D-592.             CUSTOM HEADS FOR SUPER CHARGED OR TURBO ENGINES                          NOTE: HESALTH is required for use with this cylinder head. Installing the head on a stock engine will require a shorter push rod,PN: PR-327. If your engine is decked to zero you will need PN: PR-310. All lengths can also be found in the Tech Tip section on the side bar.  Part Number: HESACH Manufacturer: Hesco Application 1: Fits all inline six cylinder Jeep engines from 1975 to 2007. Earlier models may require updated intake &/or exhaust. Application 2: Qty: 1 2 3 4 5 6 7 8 9 10

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