| THE FAST, EASY WAY TO BOLT ON 65 HORSEPOWER! TRUE BOLT-ON PERFORMANCE
- For use on 289/302/351 Windsor-style engines
- Improved air flow over original GT-40 aluminum heads
- Intake flows approximately 240 cfm at .550" lift (at 28" of H20)
- Exhaust flows approximately 170 cfm at .500" lift (at 28" of H20)
- Machined for 1.94" Intake and 1.54" exhaust valve diameters
- Ford racing "X" heads use either GT-40 or aftermarket performance: intake manifolds
- Intake port volume 178cc, exhaust port volume 62cc
- High temperature exhaust valve seats. Thick deck for improved
sealing, increased section thickness in critical areas for porting, and
webbed rocker bosses for improved strength. Designed for bolt-on rocker
arms, machined for tapered seat spark plug or gasketed. Compatible with
Ford Racing intakes, headers, and valve train components. Can be
machined for diagonal exhaust header flange mounting
- High quality original equipment style 356-T6 aluminum castings, machining and components
- Each aluminum head weighs approximately 22 lbs. – approximately 25 lbs. lighter than each cast iron GT-40 head
- These GT-40 style heads use AGSF-32C spark plugs
- Each GT-40X head is leak tested prior to assembly
- Assembled with M-6507-J302 intake valves, M-6505-G302 exhaust valves, M-6513-A50 valve springs The valve springs are compatible with all Ford Racing roller camshafts
- Designed to be used on Ford Racing Boss blocks M-6010-BOSS302 or M-6010-B302BB block with head gasket M-6051-CP331
- Check your intake manifold for port match; not all intakes are compatible due to the tall high-flow ports
- Must use M-9439-A50 intake gasket
- Designed for bolt-down rocker arms M-6564-B351 or M-6564-A50
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