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Valve Spring Alert

ATTENTION: Valve Spring Warning for All Packages

On all complete assembly packages, it is very possible that the valve springs are not correct for your camshaft. All valve springs should be checked for compatibility to your camshaft. Severe wear of valve train components and severe engine damage could result from failure to do this. Check spring requirements before heads are installed on the engine. If in doubt please contact your camshaft manufacturer or USA Performance Parts. We do carry optional springs for all of your needs.


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Pro1 LS1 CNC Ported Cylinder Heads 250 Port Volume, pair

$1,798.00

Dart's LS1 CNC Ported heads are perfect for the big cid LS Series engines. They come 100% CNC ported and competition valve jobbed for use right out of the box. Flowing 344 cfm intake and 240 cfm exhaust at .600" lift this set of heads give Maximum Bolt-on horsepower for LS engines with 4.00 bores or larger. Assemblies come with single conical (beehive) springs with steel retainers for .600 lift or dual springs with titanium retainers for .650 lift.

  • 250cc CNC Intake Port
  • 2.08 x 1.60 stainless steel valves
  • 68cc chambers
  • Single Conical Spring - 110lb @ 1.800 in, max lift .600 in
  • Dual Spring - 140lb @ 1.800, max lift .650 in

Click here for a Flow Chart.

Part NumberDescriptionSpring Dia.Head TypeRetainerSpring TypePriceIn stockPurchase
11071040 Bare, prN/AFull CNCN/AN/A$1,798.00Yes
11071040-A2S Assem, pr1.290SFull CNCSteelConical$2,198.00Yes
11071040-A3D Assem, pr1.295Full CNCTitDual$2,298.00Yes

To view this product's Specifications page, please click here.

 
This product was added to our catalog on Sunday 22 November, 2009.