CLEVELAND RAISED RUNNER
CNC COMPETITION PORT HEADS- 275CC
| TECHNICAL SPECIFICATIONS : | |
| Intake Valve Diameter: | 2.190″ |
| Exhaust Valve Diameter: | 1.650″ |
| Intake Port Volume: | 275cc |
| Exhaust Port Volume: | 122cc Minimum- Various Programs Available |
| Chambers CNC Machined | Yes |
| Chamber Volume: | 60-67cc |
| Spark Plugs | |
| Minimum Intake CSA | 2.900″ |
| Maximum Intake CSA | x.xxx” |
| Minimum Exhaust CSA | x.xxx” |
| Maximum Exhaust CSA | x.xxx” |
| Intake Seat Angle | 45 |
| Exhaust Seat Angle | 45 |
| Flow Test Bore Size | 4.155″ |
| Exhaust Flow figures with pipe | Various Programs available |
| VALVE LIFT |
.100″ | .200″ |
.300″ |
.400″ |
.500″ |
.600″ |
.700″ |
.800″ |
.900″ |
1.000″ |
| Intake Flow @28″ H2O ( 2.150″ ) | 72.9 | 153.6 | 225.7 | 287 | 336.2 | 369.4 | 3709.9 | 376.9 | 385.8 | 388.8 |
| Exhaust Flow @28″ H2O |
Flow figures are not inflated for sales purposes.
Calibration is performed on both Intake & Exhaust side of bench from 50 to 450 cfm using 11 sharp edge orifice plates.
Flow bench numbers should not be the primary concern when purchasing your next set of cylinder heads.
Porting for Power ! NOT Flow Bench Numbers – Click Here for more info
RECOMMENDED USE AND INFO:
Suitable for 408+ cubes Windsor/Cleveland stroker engines.
These cylinders heads produce 785HP on our 434 Eliminator Package by 7500 RPM with a Solid Roller camshaft on pump fuel and off the shelf pacemaker headers.( Long Engine Package # L434C5/ARR ) Click Here for More details.
Heads have produced over 800+HP with Racefuel.
Also has produced 680hp from 408 Cubes with Solid Flat tappet camshaft & pump fuel (7500rpm)
Heads must be used with a minimum extractor primary pipe size of 2.000″, Can be used with off the shelf 2.000″ Pacemaker headers
| Description | Pavtek Part # | Price |
| Assembled Cylinder Heads – Suit Solid Roller Camshaft |
H351C0414R | $ 8940 |
| Consists of : | Outright | |
| Raised Runner Raw Castings | ||
| Valves – New Stainless Steel Intake & Exhaust ( 5/16 stem ) | ||
| Springs – Pac Roller Springs ( .850″ lift max) | ||
| Retainers – New Titanium Retainers | ||
| Valve spring locaters | ||
| Valve Locks – Pac 10 Degree Chrome Moly | ||
| Valve Stem seals – Crane teflon | ||
| 5 Axis CNC Competition Porting – 100% Intake/ Exhaust/ Chambers | ||
| Multiangle Valve Seat Geometry | ||
| Backcut valves | ||
| Valve guides clearance checked & honed if required | ||
| Surface milled to your desired CC’s ( 60 to 67 CC’s ) | ||
| Springs measured & setup to suit cam to be used | ||
| Final washed and assembled | ||
LUD 15-9-2025