$2,329.00
USA Performance Big Block Chevy CNC Ported 355cc Cylinder Heads, Assembly, pr
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USA Performance Parts CNC ported heads are available with 355cc intake runners for 540 - 632 cid. We applied the airflow technology developed in by championship-winning Pro Stock engine program to produce these state-of-the-art heads. Every intake port, every exhaust runner, every valve bowl, and every combustion chamber is 100% CNC machined on special USA Performance castings manufactured for Liberty Engine Parts, a wholesale only supplier to the engine builders industry.
Multi-angle intake valve seats direct the air-fuel mixture into the chamber like an airfoil, reducing turbulence and preventing fuel separation. Fully radiused exhaust seats provide the smoothest possible transition into the ports for hot exhaust gases. Improved cylinder scavenging allows more fuel and air to be burned on the next power stroke. 121cc fast burn combustion chambers.

  • 355cc CNC ported rectangular intake ports
  • 121 cc chambers (115cc - 127cc available)
  • 2.300 x 1.880 stainless valves
  • 10 deg locks
  • A2 assemblies - dual springs 1.540 OD, 132lbs @ 1.930 install height (.650 in. max lift)
  • A3 assemblies - dual springs 1.550 OD, 225lbs @ 1.950 install height (.700 in. max lift)
  • A6 assemblies - dual springs 1.625 OD, 250lbs @ 2.000 install height (.800 in. max lift)
  • A7 assemblies - dual springs 1.640 OD, 250lbs @ 2.000 installed height (.850 in. max lift)
  • A9 assemblies - triple springs 1.650 OD, 338 lbs @ 2.100 install height (.900 in. max lift)

We Specialize in Custom Assemblies with Upgraded Springs, Valves & Retainers

Click here for a Flow Chart.

Use Manley Head Bolt Kit 42192-102 SEE BELOW

USA Performance Big Block Chevy CNC Ported 355cc Cylinder Heads, Assembly, pr

USA Performance Big Block Chevy CNC Ported 355cc Cylinder Heads, Assembly, pr
Click to enlarge image

Part NumberDescriptionSpring Dia.RetainerMax LiftPortingCamPriceIn stockPurchase
USA355CNC-A2 Assem, pr1.540DSteel.650Full CNCHyd Roller$2,329.00Yes
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USA355CNC-A2 Assem, pr1.540DSteel.650Full CNCSolid, flat$2,329.00Yes
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USA355CNC-A3 Assem, pr1.540DSteel.700Full CNCSolid Roller$2,379.00Yes
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USA355CNC-A6 Assem, pr1.625DTit.780Full CNCSolid Roller$2,579.00Yes
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USA355CNC-A7 Assem, pr1.625DTit.850Full CNCSolid Roller$2,598.00Yes
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USA355CNC-A9 Assem, pr1.650TTit.900Full CNCSolid Roller$2,649.00Yes
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This product was added to our catalog on Wednesday 14 August, 2013.  
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