SKU: SKU: EDE61035
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. Although 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.
For 350-403 c.i. Olds engines with a hydraulic roller cam, these heads are made of 356-T6 aluminum and feature 68 cc chambers, high-flow 200 cc intake and 130 cc exhaust port volumes, and 2.072” intake and 1.680” exhaust valve sizes.
| Prop 65 Y/N | Y |
| Prop 65 - Long Label | WARNING: This product can expose you to chemicals known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov. |
| Required Products | 7340 - 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 |
| Related Products | 2156 - 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 |
| Cross sell / Upsell Part Numbers | 311105 - 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 |
| 10271 | No |
| 10267 | No |
| 10266 | No |
| 6626 | 68 CCM |
| 10254 | Square |
| 10247 | 130 CCM |
| 10251 | 6 DD |
| 10249 | 1.68 IN |
| 6629 | 0.3438 IN |
| 6634 | Yes |
| 10253 | Rectangle |
| 6627 | 200 CCM |
| 10250 | 6 DD |
| 6628 | 0.3438 IN |
| 10248 | 2.072 IN |
| 10 | Aluminum |
| 10671 | Yes |
| 10255 | Manganese Bronze |
| 10252 | Chromoly Steel |
| 4624 | .545 IN |
| 10025 | Yes |
| 6631 | .6 IN |
| Cylinder Head Style | Assembled |
| Exhaust Port Location | Standard |
| Exhaust Valve Job Diameter | 1.680 IN |
| Guidplate Pushrod Size | 3/8 IN |
| Intake Port Location | Standard |
| Retainer Diameter | 1.055 IN |
| Retainer Lock Style | 7d DD |
| Retainer Material | Steel |
| Steam Holes Drilled | No |
| Valve Cover Mounting Style | Perimeter Bolt |
| Valve Lock Style | 7 DD |
| Valve Spring Type | Beehive |
| Valve Lock Material | Steel |
| 306 | Yes |