{"product_id":"edelbrock-289-302-ford-rpm-air-gap-manifold","title":"Edelbrock RPM Air-Gap Intake Manifold for Ford Small-Block 302-347","description":"\u003ch4\u003eKeep the intake charge cooler while moving the power band higher\u003c\/h4\u003e\u003cp\u003eEdelbrock 7521 is a natural-aluminum RPM Air-Gap dual-plane intake manifold for Ford small-block 302-based engines and compatible 331-347 stroker combinations. Its open valley separates the runners from hot engine oil to support a denser charge in the verified 1,500-6,500 rpm range.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAir-Gap runner design separates the plenum and runners from hot engine-oil contact\u003c\/li\u003e\n\u003cli\u003eDual-plane layout supports a broad street and strip torque curve\u003c\/li\u003e\n\u003cli\u003eLarger runner entries than the standard Performer RPM design benefit higher-displacement stroker combinations\u003c\/li\u003e\n\u003cli\u003eNatural cast-aluminum construction with square-bore carburetor flange\u003c\/li\u003e\n\u003cli\u003eIntegrated nitrous bosses for a properly engineered installation\u003c\/li\u003e\n\u003cli\u003eNo exhaust crossover and no provision for an exhaust-heated choke\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment\u003c\/h4\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eApplication Type\u003c\/th\u003e\n\u003cth\u003eVerified Engine Requirements and Exclusions\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003eEngine-specific\u003c\/td\u003e\n\u003ctd\u003eFord small-block Windsor 302-based V8 and compatible 331-347 stroker combinations; high-performance 289\/302-based engines only after complete port, head, deck-height, hood-clearance, carburetor, and accessory verification. Does not fit the 255 V8 and is not recommended for a typical 289 street build.\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number\u003c\/td\u003e\n\u003ctd\u003e7521\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003ePerformer RPM Air-Gap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Family\u003c\/td\u003e\n\u003ctd\u003eFord small-block Windsor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Engine Application\u003c\/td\u003e\n\u003ctd\u003e302-based V8 and compatible 331-347 stroker combinations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Range\u003c\/td\u003e\n\u003ctd\u003e1,500-6,500 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign\u003c\/td\u003e\n\u003ctd\u003eDual plane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCarburetor Flange\u003c\/td\u003e\n\u003ctd\u003eSquare bore; one carburetor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eNatural\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCarb Pad Height\u003c\/td\u003e\n\u003ctd\u003e4.90 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront Height\u003c\/td\u003e\n\u003ctd\u003e4.30 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Height\u003c\/td\u003e\n\u003ctd\u003e5.50 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort Exit\u003c\/td\u003e\n\u003ctd\u003e1.04 x 1.85 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEGR\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExhaust Crossover\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e085347075218\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e12 months under current Edelbrock terms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch4\u003eWhat's Included\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOne natural-aluminum RPM Air-Gap intake manifold\u003c\/li\u003e\n\u003cli\u003eOnly plugs or fittings supplied in the sealed manufacturer package\u003c\/li\u003e\n\u003cli\u003eCarburetor, intake gaskets, hardened-washer bolt kit, carburetor studs, RTV, linkage, and air cleaner are not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eAbout Edelbrock\u003c\/h4\u003e\u003cp\u003eEdelbrock develops intake manifolds, cylinder heads, carburetors, and supporting engine components around defined engine families and operating ranges. Its RPM Air-Gap designs apply competition-derived runner isolation to performance street and bracket-racing combinations.\u003c\/p\u003e\u003ch4\u003eRelated Parts\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eNo internal carburetor, gasket, bolt, linkage, or air-cleaner product is linked because those parts must match the exact cylinder heads, transmission, carburetor choice, hood clearance, and engine combination.\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eFAQ\u003c\/h4\u003e\u003cstrong\u003eWhat is the 7521?\u003c\/strong\u003e\u003cp\u003eIt is a natural-aluminum, dual-plane RPM Air-Gap intake manifold for Ford small-block performance combinations in the verified operating range.\u003c\/p\u003e\u003cstrong\u003eWhat engines is it intended for?\u003c\/strong\u003e\u003cp\u003eIt is intended primarily for 302-based Ford small-block engines and compatible 331-347 stroker combinations; a typical 289 application is not recommended.\u003c\/p\u003e\u003cstrong\u003eDoes it fit a Ford 255 V8?\u003c\/strong\u003e\u003cp\u003eNo. Edelbrock explicitly excludes the 255 V8.\u003c\/p\u003e\u003cstrong\u003eWhat carburetor flange does it use?\u003c\/strong\u003e\u003cp\u003eIt uses a square-bore flange for one carburetor.\u003c\/p\u003e\u003cstrong\u003eAre gaskets and bolts included?\u003c\/strong\u003e\u003cp\u003eNo. Select the correct intake gasket, hardened-washer bolt kit, carburetor studs, and RTV for the verified engine combination.\u003c\/p\u003e\u003cstrong\u003eDoes it have an exhaust crossover?\u003c\/strong\u003e\u003cp\u003eNo. It has no exhaust crossover and no provision for an exhaust-heated choke.\u003c\/p\u003e\u003cstrong\u003eWill it work with an AOD transmission?\u003c\/strong\u003e\u003cp\u003eEdelbrock carburetors can be used with a Ford AOD when the required compatible Lokar bracket and linkage components are installed and adjusted correctly.\u003c\/p\u003e\u003cstrong\u003eWhat must be measured before installation?\u003c\/strong\u003e\u003cp\u003eVerify head-port alignment, deck height, carburetor and air-cleaner height, distributor clearance, throttle linkage, accessories, fuel routing, and hood clearance.\u003c\/p\u003e\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\u003col\u003e\n\u003cli\u003eConfirm the Ford small-block engine family, displacement, cylinder heads, deck height, port dimensions, carburetor, transmission linkage, accessory layout, and hood clearance.\u003c\/li\u003e\n\u003cli\u003eRead the current Edelbrock instructions, disconnect the battery, drain the cooling system as required, and protect the engine from debris.\u003c\/li\u003e\n\u003cli\u003eRemove the carburetor and original intake components, label every connection, and clean the cylinder-head mating surfaces without allowing debris into the ports or lifter valley.\u003c\/li\u003e\n\u003cli\u003eDry-fit the manifold to verify port alignment, distributor clearance, carburetor height, linkage travel, thermostat housing, and accessory compatibility.\u003c\/li\u003e\n\u003cli\u003eInstall the recommended intake gaskets and RTV without using end-seal gaskets, then use hardened washers and torque the fasteners in Edelbrock's documented sequence and stages.\u003c\/li\u003e\n\u003cli\u003eReconnect fuel, cooling, vacuum, throttle, and transmission-linkage systems, check for leaks and full linkage travel, set ignition and carburetor calibration, and recheck torque after the documented heat cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003e\u003cstrong\u003eCalifornia Proposition 65 Warning:\u003c\/strong\u003e This product can expose you to chemicals including antimony oxide and other chemicals known to the State of California to cause cancer or reproductive harm. For more information, visit www.P65Warnings.ca.gov.\u003c\/p\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":68130035531855,"sku":"EDE7521","price":449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/edelbrock-7521-rpm-air-gap-intake-manifold-01.webp?v=1794494563","url":"https:\/\/www.blackopsautoworks.com\/products\/edelbrock-289-302-ford-rpm-air-gap-manifold","provider":"Black Ops Auto Works","version":"1.0","type":"link"}