LS3 270 CNC Poring

Designed for LS short-blocks with 4.000" bore or larger

The 6-Bolt design is compatible with GM LSX and World LSX blocks

Accepts Gen lV LS3 valvetrain and intake manifolds.

Uses a 2.165" intake valve and 1.600" exhaust valve

11 Degree Valve angleHas a 270cc intake port

Has a 72cc combustion chamber standard

Deck thickness of .750"

6 Bolt Standard

SPRING: PAC 1905x0.65” lift 

0.694 in. ID – 1.304 in. OD – 1.800 in. 

installed Height – 0.650 in. Max Valve Lift

Intake Valves: 2.165x 5.45"

Exhaust Valves:1.60x5.45"