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FREE AUTOTEC SHELF PART FORGED PISTONS OF YOUR CHOICE!

LS1 SB Chevy Aluminum COMPLETE CNC Ported Pro 1 Cylinder Heads #11071142

Port Volume: 250cc

Chamber Volume: 68cc

Spark Plug: Angle - Standard

Intake Valve: 2.08

Exhaust Valve: 1.60

Springs: 1.290 Beehive (1.295 double spring upgrade available for 58.00)

Dart CNC-ported aluminum cylinder heads for GM LS-series small-block V8 engines take performance to the next level.

Dart's CNC LS1 head is machined on a dedicated casting with extra-thick sections to maintain the proper wall thickness after porting.

Due to the large diameter intake valves, the Dart CNC LS1 head is recommended for use on engines with 4.00-inch and larger cylinder bores.

Precise computer controlled CNC machining, multi-angle intake seats, and radiused exhaust seats enhance airflow.

Extra material above the ports accommodates valve-train upgrades.

SHIPS ANYWHERE IN THE LOWER 48 STATES FREE!