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Chevrolet Performance 12691728 - Cast Iron L31 Vortec Small Block Chevrolet Assembled Cylinder Head

Free Shipping on Performance Cylinder Heads from the Number 1 Chevrolet Performance Dealer, SDPC.


Chevrolet Performance Parts L31 Vortec Cylinder Cast Iron Heads have set the standard for proven performance and budget spending . The best out-of-the-box head for the money! Excellent flow produces broad torque and killer power. Stock springs are good up to 0.450" lift. Requires special intake manifold to fit the Vortec bolt pattern. Price is per head.


Intake Valve 1.940”
Exhaust Valve 1.500”
Chamber (cc) 64
Intake Port (cc) 170
Exhaust Port (cc) N/A
Assembled or Bare Assembled
Valve Spring Diameter 1.250”
Max Lift 0.450”
Type Stock Single
Spark Plug Size 14mm
Reach 0.708”
Design Straight
Suggested Plug NGK TR55GP

Availability: Largest Chevrolet Performance Dealer in the World. Ship Today Service!
Shipping: Free Shipping* On Orders Over $99!
Pricing: $559.65

Free U.S. Continental Shipping


Patterned from the design of the LT1 cylinder heads from the 1992-96 Corvette, the Vortec iron heads were first used on the fuel injected 1996 pickup truck RP0 Code L31. The heads are equipped with 1.940"/1.500" valves from the factory and the stock valve springs are compatible with a maximum valve lift of up to 0.450".
Stock flow figures at 28” H20 L31 Vortec
 Lift  Intake Exhaust
0.100" 70 48
0.200" 139 101
0.300" 190 129
0.400" 227 140
0.500" 239 147


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  • 12691728
  • 12691728
  • 012503000074
  • Chevrolet Performance
  • Largest Chevrolet Performance Dealer in the World. Ship Today Service!
  • New


Shipping Information

  • Item Requires Shipping
  • 46.0 lbs.
  • W9.4000” x H8.4000” x L23.0000”
  • Free U.S. Continental Shipping
  • Free Shipping* On Orders Over $99!

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