Smeding Performance 255cc 11° As-Cast LS3 Cylinder Heads PAIR
Features:
- 255cc Intake, 95cc Exhaust & 69cc Chambers
- Virgin A356 Aluminum Castings
- 6 Bolt Head Casting with Extra Strength Decks
- Advanced 11° Valve Angle for Maximum Flow & PTV Clearance
- 2.165” Intake Valve 21-4N Alloy & 1.60” Exhaust Valve 23-8N Super Alloy
- 0.210" Intake Free Drop & 0.250" Exhaust Free Drop
- 23-8N Alloy has the same high temp characteristics of “Inconel” w/o the brittleness
- Available Complete w/ Chromoly Steel Retainers, Titanium Retainers, or Bare w/ Valves
- Billet Rocker Arm Stands Included - Compatible w/ OEM LS3 Rocker Arms
-
Compatible w/ 4 Bolt OEM Engine Blocks - 4.000" Minimum Bore Required
-
Price is for a Pair of Cylinder Heads
0.660" Spring Specs:
145# @ 1.800"
400# @ 1.130"
CB @ 1.070"
0.700" Spring Specs:
170# @ 1.800"
450# @ 1.115"
CB @ 1.000"
Head Flow Data @ 28inHg, 4.125" Bore, Intake w/ Radius, Exhaust w/o Pipe
Smeding 255cc 11 Degree As-Cast Flow Data
|
| Lift |
Intake Flow
|
Exhaust Flow
|
| .200" |
138 cfm
|
111 cfm
|
| .300" |
209 cfm
|
150 cfm
|
| .400" |
263 cfm
|
178 cfm
|
| .500" |
321 cfm
|
196 cfm
|
| .600" |
324 cfm
|
213 cfm |
| .700" |
342 cfm |
222 cfm |
