PRC 260cc LS3 CNC-Ported Cylinder Heads
Fully assembled PRC 260cc CNC-ported rectangle-port cylinder heads for LS3-family engines.
- 260cc CNC intake runners
- 68cc combustion chambers
- 13-degree valve angle
- 2.185-inch hollow-stem stainless intake valves
- 1.600-inch stainless exhaust valves
- TSP .660-inch PAC dual spring package with titanium retainers
- CHE bronze guides
- Integrated rocker pedestals
- Six-bolt casting compatible with standard four-bolt blocks
Fitment: LS3, L92, L99, LSA, and related Gen 4 rectangle-port LS engines. Verify bore size, compression, piston-to-valve clearance, pushrod length, and intake-manifold compatibility before installation.
Processing & Shipping Overview
Processing occurs before shipping.
Most in-stock items typically process within 2–3 business days before shipment or pickup. Expedited shipping options affect transit time after an order ships and do not speed up processing.
Made-to-order, special-order, vendor drop-ship, and freight items require additional processing time before shipping. Any extended lead times will be noted on the product page when applicable.
For the most up-to-date order status or lead time questions, please contact sales@smgspeed.com or use live chat during business hours.