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- 255cc intake, 95cc exhaust, 69cc chambers
- Virgin A356 aluminum castings
- 6-bolt head casting with reinforced decks
- Advanced 11° valve angle for maximum flow and piston-to-valve 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 delivers high-temp performance like Inconel without brittleness
- Available complete with chromoly or titanium retainers, or bare with valves
- Billet rocker arm stands included – compatible with OEM LS3 rocker arms
- Compatible with 4-bolt OEM engine blocks – 4.000" minimum bore required
- Sold as a complete set
0.660" Spring Specs:
- 145 lbs @ 1.800"
- 400 lbs @ 1.130"
- Coil bind @ 1.070"
0.700" Spring Specs:
- 170 lbs @ 1.800"
- 450 lbs @ 1.115"
- Coil bind @ 1.000"
| Valve Lift | Intake | Exhaust |
|---|---|---|
| 0.200" | 138 | 111 |
| 0.300" | 209 | 150 |
| 0.400" | 263 | 178 |
| 0.500" | 321 | 196 |
| 0.600" | 324 | 213 |
| 0.700" | 342 | 222 |
Flow data tested at 28inHg, 4.125" bore. Intake measured with radius; exhaust measured without pipe.
Important Note: Static flow numbers should not be the only benchmark. Real-world engine dynamics involve pulsed air/fuel movement. The Smeding 11° heads outperform competitor 12° designs across the entire dyno curve by minimizing turbulence and maximizing efficiency.
