SKU: M-6049-X307

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 the M-6010-BOSS302 block with head gasket M-6051-CP331 

INSTALLATION NOTES: 

Will not fit 1986 5.0L with flat-top pistons unless pistons are notched for valve relief Must use head bolt kit M-6065-D289 to install cylinder heads on 289/302 blocks or head bolt and head gasket kit M-6051-A50 and intake gasket M-9439-A50/A51 Check rocker arm clearance to valve springs with production rocker arms 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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