Description: What\'s the easiest way to bolt on 65 horsepower? Bolt on Ford Performance Parts 302/351W X-Head aluminum assembled cylinder heads. They offer performance and weight savings--approximately 25 lbs. lighter than cast iron GT-40 heads! X-heads utilize high-quality 356-T6 aluminum castings, machined for improved air flow, and feature a thicker deck for improved sealing. Designed for use on your 289/302/351 Windsor-style engine, these cylinder heads also feature high-temperature exhaust valve seats, bronze guides, common rocker bosses for strength, and increased section thickness in critical areas for porting. Top off your Ford Performance Parts block with the made-in-the-USA quality and performance of X-head aluminum assembled cylinder heads.Additional features include:* Intake flows approximately 240 cfm at .550 in. lift (at 28 in. of H20)
* Exhaust flows approximately 170 cfm at .500 in. lift (at 28 in. of H20)
* Use either GT-40 or aftermarket performance intake manifolds
* Must check your intake manifold for port match; not all intakes are compatible due to the tall high-flow ports
* Does not fit M-9424-Z51/-Z51P
* Machined for AGSP-32C gasket seat spark plugs
* Each head weighs approximately 22 lbs.
* Leak tested prior to assembly
* Assembled with M-6507-J302 intake valves, M-6505-G302 exhaust valves, PAC 1219X Ovate Beehive valve springs
* Closed spring pressure is 145 lbs. at 1.800 in., 358 lbs. at 1.175 in.
* Compatible with all Ford Performance roller camshafts and aftermarket hydraulic roller camshafts up to .600 lift
* Designed to be used on Ford Racing Boss blocks M-6010-BOSS302, M-6010-B302BB, M-6010-BOSS35195, M-6010-BOSS35192 and M-6010-BOSS351BB blocks
* Head bolts M-6065-BOSS or head stud kit M-6014-BOSS and head gasket M-6051-CP331/S331, or Big Bore application M-6051-R351 recommended
* Must use head bolt kit M-6065-D289 to install cylinder heads on 289/302 production blocks or head bolt and head gasket kit M-6051-A50
* Designed for bolt-down rocker arms part number M-6564-B351 for a 1.6 ratio; or part number M-6564-A50 for a 1.7 ratio
* Must check rocker arm clearance to valve springs with production rocker arms
* Use Felpro® exhaust gasket part number 1415
* Will not fit 1986 5.0L with flat-top pistons unless pistons are notched for valve reliefCylinder Head, Turbo Swirl, Aluminum, Assembled, 64cc Chamber, 178cc Intake Runner, Ford, 302, 351W.
