{"product_id":"cyl-head-sb-oldsmobile-perf-rpm-for-hyd-roller-cam-complete","title":"CYL HEAD SB OLDSMOBILE PERF RPM FOR HYD ROLLER CAM COMPLETE","description":"Intended for installation on 1965-1976 Small-Block Oldsmobile 350-403 c.i. engines equipped with a hydraulic roller camshaft, these 356-T6 aluminum casting cylinder heads (#61035) are a modern refinement to our #6051 heads, except they can accommodate a factory-style mechanical fuel pump. A smaller 68 cc combustion chamber achieves a more appropriate small block compression ratio compared to our PN 61025\/61029’s larger 77 cc chamber, which yields a lower compression ratio than most engine builders desire on a small block engine. These heads require a 3.9375” minimum bore and feature a modern chamber design with optimized spark plug positioning. Maximum airflow is achieved through the factory 6-degree valve angle using high-flow 200 cc intake and 130 cc exhaust port volumes, along with 2.072” intake and 1.680” exhaust valve sizes in their O.E. positions. A finished deck thickness with added material above the intake port and pre-counterbored head-bolt holes for .5” diameter studs provide extra clamping force in key areas. A stud-and-guide plate valvetrain system (as opposed to the O.E. pedestal type) provides a solid foundation for the beefier diameter pushrods, and Helicoil inserts in the exhaust and rocker stud holes keep bolts secured. However, there are no provisions for a heat crossover.\r\nAlthough these heads will fit on Big-Block Oldsmobile engines, the 68-cc combustion chamber size is not ideal for a big-block application as it will raise compression. See PN61025 and PN61029 for big-block specific cylinder heads.\r\n\u003cul\u003e\t\u003cli\u003eFactory 6-degree valve angle\u003c\/li\u003e\r\n\t\u003cli\u003eMaximum compatibility with OEM and aftermarket components\u003c\/li\u003e\r\n\t\u003cli\u003eMechanical Fuel Pump Clearance Cutout\u003c\/li\u003e\r\n\t\u003cli\u003eAllows the use of an \"OEM\" style mechanical fuel pump\u003c\/li\u003e\r\n\t\u003cli\u003eOEM Port Locations\u003c\/li\u003e\r\n\t\u003cli\u003eRetains compatibility with OEM and popular aftermarket manifolds and Headers\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cb\u003eVehicle Specific\u003c\/b\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e1965-1976 Small Block Oldsmobile 260 thru 403 CID, can also be used on some low compression Big Block applications\u003c\/li\u003e\r\n\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eAttributes:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eBrand Name: \u003c\/b\u003eEdelbrock\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eGTIN: \u003c\/b\u003e00085347610358\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC-Machined Combustion Chamber: \u003c\/b\u003eNo\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC-Machined Exhaust Runner: \u003c\/b\u003eNo\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC-Machined Intake Runner: \u003c\/b\u003eNo\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCombustion Chamber Volume: \u003c\/b\u003e68\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCross sell \/ Upsell Part Numbers: \u003c\/b\u003e311105 - Super StreetFighter TH350 6\" Tailshaft Non Lock-Up (Buick\/Oldsmobile\/Pontiac), K42-222-4 - Xtreme Energy 218\/224 Hydraulic Flat Cam K-Kit for Oldsmobile 260-455\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCylinder Head Style: \u003c\/b\u003eAssembled\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Port Location: \u003c\/b\u003eStandard\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Port Shape: \u003c\/b\u003eSquare\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Runner Volume: \u003c\/b\u003e130\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Angle: \u003c\/b\u003e6\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Diameter: \u003c\/b\u003e0.3438\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Job Diameter: \u003c\/b\u003e1.680\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Stem Diameter: \u003c\/b\u003e1.68\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eGuide Plates Included: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eGuidplate Pushrod Size: \u003c\/b\u003e3\/8\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Port Location: \u003c\/b\u003eStandard\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Port Shape: \u003c\/b\u003eRectangle\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Runner Volume: \u003c\/b\u003e200\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Angle: \u003c\/b\u003e6\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Diameter: \u003c\/b\u003e0.3438\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Job Diameter: \u003c\/b\u003e2.150\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Stem Diameter: \u003c\/b\u003e2.150\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eMaterial: \u003c\/b\u003eAluminum\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eRelated Products: \u003c\/b\u003e2156 - Performer Intake Manifold for 1965-79 Pontiac 326-455 Non-EGR 7156 - Performer RPM Pontiac 326-455 Intake Manifold 7373 - Engine Gasket Set (Head \/ Intake \/ Exhaust \/ Valve Cover) for Oldsmobile 4485 - Signature Series Valve Covers for Oldsmobile 350-455 V8 3712 - Performer-Plus Camshaft Kit for Small-Block Oldsmobile 350-403 V8 22764 - Edelbrock Max-Fire Distributor for Oldsmobile 260-455 V8 85582 - Edelbrock E-Series Cylinder Head Bolt Kit 85582 for Oldsmobile big-block 3113KT - Adjustable Double Roller Timing Set for Oldsmobile 400-455\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eRequired Products: \u003c\/b\u003e7340 - Cylinder Head Gasket Set for Oldsmobile 7238 - Exhaust Manifold Gasket Set for Oldsmobile 7284 - Intake Manifold Gasket for 1965-76 400-425-455 Oldsmobile engines 7598 - Valve Cover Gasket Set for Oldsmobile\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eRetainer Diameter: \u003c\/b\u003e1.055\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eRetainer Lock Style: \u003c\/b\u003e7d\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eRetainer Material: \u003c\/b\u003eSteel\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eRocker Arm Studs\/Bolts Included: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eSteam Holes Drilled: \u003c\/b\u003eNo\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Cover Mounting Style: \u003c\/b\u003ePerimeter Bolt\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Guide Diameter: \u003c\/b\u003e.545\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Guide Material: \u003c\/b\u003eManganese Bronze\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Lock Material: \u003c\/b\u003eSteel\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Lock Style: \u003c\/b\u003e7\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Locks Included: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Spring Maximum Lift: \u003c\/b\u003e.6\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Spring Type: \u003c\/b\u003eBeehive\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch3\u003eExtended Information:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eCountry of Origin: \u003c\/b\u003eUS\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eEmissions : \u003c\/b\u003eRacing or Pre-Emissions Use Only\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch3\u003ePacking Information:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eQuantity of Each: \u003c\/b\u003e1\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003ePackage UOM: \u003c\/b\u003eEA\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eDimension: \u003c\/b\u003e25.9 x 11.3 x 8.1 inches\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eWeight: \u003c\/b\u003e35.7 POUNDS\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch3\u003ePDF:\u003c\/h3\u003e\r\n\u003cp\u003e\r\n\u003c\/p\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/sdda.semadata.org\/Standard\/Edelbrock\/63-61025_Oldsmobile_Installation_Instructions.pdf\" target=\"_blank\"\u003e\u003cimg 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style=\"display:inline\"\u003e \u003c\/a\u003e\u003c\/div\u003e\r\n\r\n\u003cdiv id=\"sema-product-fitment\" class=\"product__accordion accordion fitment\"\u003e\u003c\/div\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":44336460791853,"sku":"BDVJ-61035","price":2493.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/2780\/2157\/files\/EDEL_61035_20Roller_V9.jpg?v=1762922524","url":"https:\/\/montgomeryparts.com\/products\/cyl-head-sb-oldsmobile-perf-rpm-for-hyd-roller-cam-complete","provider":"Montgomery Parts","version":"1.0","type":"link"}