Speedmaster®
Chevy SBC 350 175cc 59cc Straight Hydraulic Flat Assembled Cylinder Heads
Product Information
Specs
| Brand: | Speedmaster |
| Part Number: | PCE281.2158 |
| Part Type: | Cylinder Head [Assembled] |
| Product Line: | Hydraulic Flat Tappet |
| Cylinder Head Style: | Assembled |
| Cylinder Head Material: | Cast Iron |
| Cylinder Head Finish: | Natural |
| Combustion Chamber Volume (cc): | 59 cc |
| CNC-Machined Combustion Chamber: | No |
| Intake Runner Volume (cc): | 175 cc |
| Exhaust Runner Volume (cc): | n/a |
| CNC-Machined Intake Runner: | No |
| CNC-Machined Exhaust Runner: | No |
| Intake Port Shape: | Rectangular |
| Intake Port Location: | Standard |
| Exhaust Port Shape: | Square |
| Exhaust Port Location: | Standard |
| Spark Plug Style: | Straight |
| Comp. Valve Job: | No |
| Intake Valves Included: | Yes |
| Intake Valve Diameter (in): | 1.940 in. |
| Exhaust Valves Included: | Yes |
| Exhaust Valve Diameter (in): | 1.500 in. |
| Valve Springs Included: | Yes |
| Maximum Valve Lift (in): | 0.580 in. |
| Outside Diameter of Outer Spring (in): | 1.250 in. |
| Number of Springs Per Valve: | Single |
| Damper Spring Included: | Yes |
| Retainers Included: | Yes |
| Retainer Material: | Chromoly steel |
| Locks Included: | Yes |
| Lock Style: | 7 degree |
| Valve Stem Seals Included: | Yes |
| Rocker Arm Studs Included: | NoÊ |
| Rocker Arms Included: | NoÊ |
| Rocker Arm Nuts Included: | NoÊ |
| Guideplates Included: | NoÊ |
| Valve Cover Mounting Style: | Center & Perimeter Bolt |
| Accessory Bolt Holes Drilled: | YesÊ |
| Intake Valve Angle: | 23 deg. |
| Exhaust Valve Angle: | 23 deg. |
| Valve Guides Included: | YesÊ |
| Valve Guide Material: | BronzeÊ |
| Valve Seats Machined: | Yes |
| Valve Seat Machine Style: | 3-angle |
| Valve Seat Material: | Ductile ironÊ |
| Steam Holes Drilled: | No |
| Oiling Style: | Through pushrodÊ |
| Machined for O-Ring: | NoÊ |
| Heat Crossover: | No |
| Quantity: | Sold as a pair. |
Description
Assembly Specifications
Max Lift: .520"
Coil Bind: 1.080"
Intake Install: 125lbs @ 1.750
Exhaust Install: 125lbs @ 1.750
Closed Sear Pressure: 125lbs
Open Seat Pressure: 335lbs
Warranty Information
12-Month Limited Worldwide Warranty
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Installation Guide
Our AI assistant generates a step-by-step guide for this product — covering installation, maintenance, and troubleshooting.
This AI-generated guide is for general reference only and does not constitute official Speedmaster product documentation. Always verify fitment, torque specifications, and safety requirements before installation.