Speedmaster . PCE281.2026

CNC Aluminum Cylinder HeadSmall Block Chevy 350 w/Hydraulic Roller CamAssembled Head70cc Combustion Chamber217cc Intake RunnerStraight PlugIncludes Valves & SpringsSet of 2 Special Note: Camshaft and Lifters Not Included Assembly Specifications<br/><br/> Max Lift: .580"<br/> Coil Bind: .750"<br/> Intake Install: 145lbs @ 1.9<br/> Exhaust Install: 145lbs @ 1.9<br/> Closed Sear Pressure: 145lbs<br/> Open Seat Pressure: 360lbs<br><br/><br/>All Speedmaster 23deg. Small Block Chevy heads are available with Straight or Angled sparkplugs. Standard valve sizes are 2.020" Intake, and 1.60" Exhaust, both +.100" length. While the 2.02" valves are standard issue, all of our 23deg. aluminum heads can accept a 2.05" intake valve with minimal additional work. Some of our CNC ported heads (PCE281.1354-1448) are designed around 2.05" Intake valves. Our cast iron heads use 1.94" intake valves, and 1.50" exhaust valves. For those racers looking for a head with 800+hp potential, step up to our new 15deg heads! These heads have room for huge 2.180"-2.200" intake valves. We even have the matching rockers!<br/><br/>Speedmaster CNC ported cylinder heads are machined on dedicated 4-axis and 5-axis CNC