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Vehicle Info NeededBLUEPRINT ENGINESPART NUMBER: 138-HP8103
HP8103 Muscle Car Series Aluminum Cylinder Head Small Block Chevy
$94900
Ships on 10/20/2026
Lowest Price GuaranteeMuscle Car Series Aluminum Cylinder Heads
- Muscle Car Series Aluminum Cylinder Head
- Small Block Chevy
- 220cc Intake Runner
- 64cc Combustion Chamber
- Straight Plug
- Assembled
- Sold Individually
Features: - Combustion Chamber Volume: 64cc
- Intake Runner Volume: 220cc
- Exhaust Runner Volume: 67cc
- Intake Port Location: Standard
- Exhaust Port Shape: Square-port
- Exhaust Port Location: Standard
- Spark Plug Style: Straight, .750 Reach Gasket
- Intake Valve Diameter (in): 2.080"
- Exhaust Valve Diameter (in): 1.600"
- Maximum Valve Lift (in): .650"
- Spring Pressure Closed: 125-135 @ 1.800"
- Spring Pressure Open: 360-380 @ 1.150"
- Outside Diameter of Outer Spring (in): 1.295"
- Number of Springs Per Valve: Dual
- Retainer Material: Chromemoly Steel
- Lock Style: 7 degree
- Valve Stem Seal Style: Viton® Fluoroelastomer
- Rocker Arm Nut Thread Size: 7/16" x 20
- Guideplate Pushrod Size: 5/16"
- Valve Cover Mounting Style: Perimeter and Center Bolt
- Accessory Bolt Holes Drilled: Yes
- Intake Valve Angle: 23 Degree
- Exhaust Valve Angle: 23 Degree
- Valve Guide Material: Manganese bronze
- Valve Seat Machine Style: 5-angle
- Valve Seat Material: Chrome Nickel
- Steam Holes Drilled: No
- Oiling Style: Through pushrod
- Machined for O-Ring: No
- Heat Crossover: No
The BluePrint Muscle Car Series Small Block Chevy Aluminum Cylinder Heads are designed for hydraulic flat tappet and hydraulic roller cams. These 220cc intake runner heads have time and time again been proven to make more power than most other similar priced and designed heads. The as cast 67cc exhaust runner port and 64cc combustion chamber design, combined with high quality 21-4n Stainless steel 2.08" intake and 1.880" exhaust valves, Viton seals, and double springs make these heads a great value as well as making great power!
| Lift (Intake) | CFM @ 28'' H2O |
| 0.100'' | 77.2 |
| 0.200'' | 149.1 |
| 0.300'' | 193.8 |
| 0.400'' | 231.7 |
| 0.500'' | 262.2 |
| 0.600'' | 273.7 |
| 0.700'' | 277.2 |
Part TypeCylinder Head
Product LineBlueprint Engines Small Block Chevy 220cc Aluminum Cylinder Heads
BrandBLUEPRINT ENGINES
Package Height7.1
Package Width9.7
Package Length21.7
Weight29.79 PG
Part CategoryPerformance Parts
Cylinder Head MaterialAluminum
Intake Port LocationStandard
Rocker Arm Nut Thread Size (In.)7/16"-20
Exhaust Valves IncludedYes
Locks IncludedYes
Retainers IncludedYes
Lock Style7 degree
Guideplates IncludedYes
Rocker Arms IncludedNo
Oiling StyleThrough pushrod
Rocker Arm Nuts IncludedNo
Cylinder Head FinishNatural
Valve Seats MachinedYes
Intake Valve Angle23
Maximum Valve Lift0.65 in (16.51 mm)
Valve Seat MaterialChrome nickel
Heat CrossoverNo
Number Of Springs Per ValveDual
Valve Springs IncludedYes
Valve Seat Machine Style5-angle
Damper Spring IncludedYes
Valve Guides IncludedYes
Cnc-Machined Intake RunnerNo
Intake Valves IncludedYes
QuantitySold individually
Valve Stem Seals IncludedYes
Intake Valve Diameter2.08 in (52.832 mm)
Accessory Bolt Holes DrilledYes
Exhaust Runner Volume (Cc)67
Exhaust Port LocationStandard
Valve Guide MaterialManganese bronze
Outside Diameter Of Outer Spring1.295 in (32.9 mm)
Combustion Chamber Volume (Cc)64
Machined For O-RingNo
Exhaust Valve Angle23
Steam Holes DrilledNo
Rocker Arm Studs IncludedYes
Cylinder Head StyleAssembled
Part FitmentSemi Universal
Valve Cover Mounting StyleCenter and perimeter bolt
Retainer MaterialChromoly steel
Intake Runner Volume (Cc)220
Cnc-Machined Exhaust RunnerNo
Cnc-Machined Combustion ChamberNo
Exhaust Valve Diameter1.88 in (47.752 mm)
Vendor Part NumberHP8103
Package Qty1
Package TypeEA
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