Speedmaster®
Chevy SBC 350 Angle Plug Hyd Roller Cylinder Head Top End Engine Combo Kit
Specs
| Brand: | Speedmaster |
| Part Number: | PCE435.1003 |
| Part Type: | Cylinder Head Combo |
| Product Line: | Hydraulic Roller Tappet |
| Camshaft Included: | No |
| Intake Manifold Included: | Yes |
| Fuel Delivery Style: | Carbureted |
| Intake Material: | Aluminum |
| Intake Finish: | Natural |
| Carburetor Quantity: | One |
| Intake Style: | Single plane with divider |
| Intake Basic Operating RPM Range: | 1,500-6,500 |
| Intake Manifold Height: | 4.650 in. |
| Intake Manifold Model (descriptive): | Speedmaster - Eliminator Series |
| Timing Chain and Gears Included: | No |
| Lifters Included: | No |
| Gaskets Included: | Yes |
| Cylinder Head Style: | Assembled |
| Cylinder Head Material: | Aluminum |
| Cylinder Head Finish: | Natural |
| Combustion Chamber Volume (cc): | 64 cc |
| CNC-Machined Combustion Chamber: | No |
| Intake Runner Volume (cc): | 190 cc |
| CNC-Machined Intake Runner: | No |
| CNC-Machined Exhaust Runner: | No |
| Intake Port Shape: | Square |
| Intake Port Location: | Standard |
| Exhaust Port Shape: | Square |
| Exhaust Port Location: | Standard |
| Spark Plug Style: | Angle |
| Comp. Valve Job: | No |
| Intake Valves Included: | Yes |
| Intake Valve Diameter (in): | 2.020 in. |
| Exhaust Valves Included: | Yes |
| Exhaust Valve Diameter (in): | 1.600 in. |
| Intake Valve Angle: | 23 deg. |
| Exhaust Valve Angle: | 23 deg. |
| Valve Springs Included: | Yes |
| Outside Diameter of Outer Spring (in): | 1.450 in. |
| Damper Spring Included: | Yes |
| Number of Springs Per Valve: | Dual |
| Retainers Included: | Yes |
| Retainer Material: | Chromoly steel |
| Locks Included: | Yes |
| Lock Style: | 10 degree |
| Valve Stem Seals Included: | Yes |
| Valve Stem Seal Style: | Positive stop |
| Rocker Arms Included: | Yes |
| Rocker Arm Studs Included: | Yes |
| Rocker Arm Nuts Included: | Yes |
| Rocker Arm Nut Thread Size: | 7/16 in. |
| Guideplates Included: | Yes |
| Guideplate Pushrod Size: | 5/16 in. |
| Pushrods Included: | No |
| Valve Covers Included: | Yes |
| Valve Cover Material: | Cast aluminum |
| Valve Cover Finish: | Polished |
| Valve Cover Mounting Style: | Perimeter bolt |
| Accessory Bolt Holes Drilled: | Yes |
| Valve Guides Included: | Yes |
| Valve Guide Material: | Bronze |
| Valve Seats Machined: | Yes |
| Valve Seat Machine Style: | 3-angle |
| Valve Seat Material: | Ductile iron |
| Steam Holes Drilled: | No |
| Oiling Style: | Through pushrod |
| Machined for O-Ring: | No |
| Heat Crossover: | No |
| Cylinder Head Bolts Included: | No |
| Quantity: | Sold as a kit. |
Description
Don't spend hours figuring out which pieces and parts you need to get what you want from your engine. Speedmaster has already done the work for you; our Top-End engine kits will save you the time and hassle of mixing and matching components yourself. These kits are specifically designed to deliver the performance you want, at a better price than purchasing the parts separately.
Kits include:
Fully assembled Speedmaster cylinder heads
Intake manifold
Valve covers
Intake manifold gaskets
Roller rockers
Guideplates
Screw in studs
Assembly Specifications
Max Lift: .580
Coil Bind: .750
Intake Install: 145lbs @ 1.9
Exhaust Install: 145lbs @ 1.9
Closed Sear Pressure: 145lbs
Open Seat Pressure: 360lbs
Cylinder Heads Suggested Parts
Head Gaskets
The head gasket we recommend for our 23deg. heads used on 327/350/383/400 SBC engines without steam holes is Felpro #1003. On engines using the GM 400 block, or aftermarket blocks with steam holes, use Speedmaster PCE348.1006 or Felpro #1014.
Push Rods
Our aluminum 23deg. heads typically use +.100" (longer than stock) pushrods, Depending on the components used, it is possible that you may need pushrods shorter or longer than that so we recommend that you use an adjustable pushrod to dial in your rocker geometry and order pushrods to match.
Spark Plugs
All Speedmaster 23deg. SBC heads use standard 14mm. x 750" reach, 5/8 hex, gasket seat sparkplugs like NGK R5671A-7, Autolite 3924, Champion RC12YC, etc. Remember that higher compression/ boost require a colder heat range sparkplug.
Head Bolts / Studs
Our 23 degree heads utilize standard head bolts or studs. Our part number for head bolts is PCE279.1002, and the head studs are PCE279.1001. For the 15 degree heads, we recommend SM2451-15DEG. headstud kit with 3/8" reduced shank on the studs between intake ports. The ARP head bolt part number is 134-3601, and ARP head studs 234-4301 for the 23 degree heads. ARP also makes a head stud kit that is compatible with our 15deg. heads on cast iron blocks with part number 234-4723.
Exhaust Gaskets
We recomend the use of our Exhaust gaskets # SM5120 or Fel-Pro #1405 on our 23 degree heads. On our 15 degree heads, use SM5121 or Fel-Pro #1409.
Roller Rockers Information
Speedmaster Aluminum Roller Rockers are extruded from 6061 T6 Aluminum. The larger needle bearing fulcrum can withstand valve spring loads up to 600lbs, while the extruded body has a tensile strength over 60,000 PSI. Ideally suited for use with Solid / Mechanical flat tappet and Hydraulic Roller Cams. They feature very precise valve operation, horse power increase of 10-15, increases valve train life dramatically, acceleration is more responsive, oil temp will run approximately 5-10 degrees cooler.
Prop 65 Warning
Ratings & Reviews
1 Review
William - | 05/23/2023 8:31 am
GREAT kit for massive torque
Very nice kit. I did have to order up a set of intake gaskets to match the ports though. VERY clean castings, did not have to do ANY clean up on them at all. Kit comes with 1.6 ratio rockers and actual double springs instead of a spring and a damper spring which always end up breaking up. You will need some set screws to seal off the vortec holes on the heads. I am running a Howards roller cam in a truck and so far the build works very well. As an added bonus Speedmaster gives a Military/Veteran discount! The ONLY issue I had during the install was that my dowel pins in the block did not line up with the pin sockets in the heads. These people are GREAT to deal with. I have used other brands that cost a LOT more that I had to do a lot of cleanup on, will be using Speedmaster only from now on.