GPI – Ported Aftermarket Casting LS3 / L92 / L99 / LSA Cylinder Head Package




  • Our 268CC LS3 / L92 / L99 / LSA head was developed specifically for the stock displacement LS engine to deliver improved cylinder fill in the lower RPM ranges while adding substantial airflow increase in the upper Ranges as well.
  • Our testing has shown over 30 hp increase while improving torque below the curve


Refundable Core Charge *

GPI offers an optional Refundable Core Charge.

  • If you want to receive credit for your OEM heads – Make a note during checkout that you will send us your OEM heads and when we receive your heads – we will refund you the $500 Core Charge.

Please contact us for specific build instructions prior to ordering this product


Additional information

Weight 24 lbs
Dimensions 26 × 12 × 12 in
Valve Springs

BTR .660" Lift Platinum Valve Spring Kit(For LSX Engines), No Valve Spring Kit


Titanium, Steel

Locator Type

.505" ID .060" Thick (Standard Size), Bronze Guide .565" ID .060 Thick

Chamber Size

64cc, 65cc, 66cc, 67cc, 68cc, 69cc, 70cc, Stock Compression

Spring Set up and Assembly

Yes, No Thanks


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