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OPR Top End Engine Kit (87-93 5.0L Mustang)

Item 99941
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AmericanMuscle no longer carries the OPR Top End Engine Kit (87-93 5.0L Mustang). Please check out 1979-1993 Foxbody Mustang Engine for an updated selection.
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    Product Information

    Features, Description, Reviews, Q&A, Specs & Installation

    Features

    • Bolt on More Horsepower
    • Complete Top End Kit
    • Improves Air Flow Over Original GT-40 Heads
    • Lightweight Aluminum Construction
    • Includes GT40X Heads, XE264HR Stage I Camshaft and Typhoon Intake Manifold
    • Fits 1987-1993 5.0L Mustangs

    Description

    More Power. Increase the horsepower and torque output of your push rod 5.0L engine with an OPR Top End Engine Kit from AmericanMuscle that includes Ford Racing Turbo-Swirl GT40X Aluminum Heads. This Top End Engine Kit will greatly improve airflow over the original stock design allowing you to bolt-on over 65 more rear wheel horsepower.

    Kit Includes.
    This Top End Engine Kit includes Ford Racing Turbo-Swirl GT40X Aluminum Heads, Comp Cams Xtreme Energy XE264HR Stage I Camshaft, Typhoon Intake Manifold, Aluminum Valve Covers, Magnum Double Roller Timing Chain Set, ARP High Performance Series Head Bolt Kit, and a Ford Racing Engine Gasket Kit.

    GT40X Aluminum Heads.
    Made from high quality 356-T6 aluminum castings, these Ford Racing GT-40X heads have an intake port volume of 178cc allowing for an intake flow of approximately 240 cfm at .550" lift (at 28" of H20) and an exhaust port volume of 62cc allowing for an exhaust flow of approximately 170 cfm at .500" lift (at 28" of H20). Machined for 1.94" Intake and 1.54" exhaust valve diameters.

    Xtreme Energy Stage I Camshaft.
    This Comp Cams Xtreme Energy Hydraulic roller lifter cam is a good replacement upgrade for the High Output (HO) 5.0 that was featured in the later Foxbody Mustangs for mild street performance gains. Perfect for bolt on modifications to make good overall power with a smooth idle without sacrificing daily drive-ability.
     
    Typhoon Intake Manifold. Completed in a natural satin finish this aluminum Professional Products Typhoon Intake Manifold will allow your Pony to breath much easier with no loss of low end torque. A 70mm Throttle Body is recommended for optimum performance of your 5.0 Mustang.

    Application.
    This OPR Top End Engine Kit is designed for use on the 1987 to 1993 Mustangs equipped with the iconic 5.0L V8 engine, including the LX 5.0, GT and SVT Cobra models.

    OPR

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    Install Details & What's in the Box

    Installation Info

    Installation Time

    (approx) a Day

    Difficulty Level:

    Mechanical expertise or professional installation required.

    Installation Guides

      No guide available for this part yet.

    What's in the Box

    • (2) Ford Racing Turbo-Swirl GT40X Aluminum Head
    • (1) Comp Cams Xtreme Energy XE264HR Stage I Camshaft
    • (1) Professional Products Satin Typhoon Intake Manifold
    • (1) Upper to lower intake gasket
    • (1) Upper plenum to intake gasket
    • (2) Canton Aluminum Valve Covers
    • (1) Filler Cap
    • (1) Comp Cams Crank Sprocket
    • (1) Comp Cams Camshaft Gear
    • (1) Comp Cams Timing Chain
    • (20) ARP Bolts
    • (20) ARP Washers
    • Ford Racing Complete Engine Gasket Kit

    Warranty

    OPR offers our valued customers the following Limited Warranty on all OPR product purchased after September 1st, 2026.

    What is Covered

    Subject to the terms, exclusions and limitations herein, and with respect only to products first sold in the United States, OPR warrants that its products shall be free of manufacturing defects for five (5) years from the date of initial retail purchase when the OPR product is installed and used on purchaser's vehicle according to supplied product installation instructions and/or warnings. This Limited Warranty is made only with respect to the initial purchaser and is not transferrable. OPR reserves the right to require proof of purchase as a condition of this Limited Warranty and to make future revisions to this product or its Limited Warranty without obligation to provide notice of same to purchaser or to conform existing product to future revisions. Any change to this warranty made after purchase may be applied retroactively at the sole discretion of OPR.

    What is Not Covered

    Your OPR Limited Warranty does not cover damage or claims to any component, vehicle, or person other than the OPR product purchased. Your Limited Warranty is expressly limited to replacement of the item itself shall OPR determine item was not free of defect. As such, this Limited Warranty does not cover damage or claims to any component, vehicle, or person OPR determines to have been damaged by or subjected to:

    • Installation damage, collision damage, alteration, modification, misuse or failure to maintain.
    • Damage in any part attributable to:
      1. vehicle systems or components or
      2. combination with non-OPR products.
    • Normal wear and tear/product deterioration.
    • Theft, vandalism or other negligent or intentional damage.

    Remedy Limited to Repair/Replacement:

    The exclusive remedy provided for products covered under this Limited Warranty shall be, upon OPR's inspection and at OPR's option, either repair or replacement of product or parts (new or refurbished). Any parts repaired or replaced will be considered part of the original product and will not extend the term of Limited Warranty. Customers requesting warranty consideration should first contact the independent distributor selling your product to obtain a Returned Goods Authorization number. All removal, shipping, and installation costs are customer's responsibility. If a replacement part is needed before your part can be returned, you must first purchase the replacement part. Then, if OPR determines the part warrantable, you will be credited the purchase price of that part.

    This warranty is the only warranty made in connection with the purchase of this product. OPR neither assumes nor authorizes any manufacturer, vendor, retailer, other person or entity to assume for it any other obligation or liability in connection with its products or this Limited Warranty.

    Other Limitations - Exclusion of Damages - Your Rights Under State Law:

    • In consideration of the purchase price paid, neither OPR nor any independent distributor are responsible for any loss of use or time, rental costs, or for any incidental, consequential, punitive or other damages (whether arising in tort or contract) you may have or incur in connection with your vehicle, or your OPR product. Your exclusive remedy hereunder is repair/replacement of the item itself or refund as described above at OPR's option. All implied warranties of merchantability and fitness for a particular purpose are hereby disclaimed or limited to the extent allowed under your jurisdiction.

    Tech Specs

    4.4

    Customer Reviews (7)

    Questions & Answers (26)