12629049 - LS6 Bare Cylinder Head, Bare No Springs Or Valves

The LS Family Production and C5R Aluminum Heads

Great cylinder-head airflow has been a key enabler of the LS Series exceptional performance. GM Performance Parts delivers those power-building attributes to you with a range of production-style aluminum heads from the LS6 heads for smaller-displacement engines to LS7 style heads for 427-inch-and-larger combinations, our aluminum heads benefit from General Motors extensive research and development program, ensuring maximum airflow without compromises. In fact, many professional builders use our heads as straight bolt-ons, with no further machining. Many of our assembled heads use premium machining and materials, including CNC finishing and porting, along with lightweight, hollow-stem valves, sodium-filled exhaust valves and on some heads lightweight titanium intake valves.

Aluminum LS Family Head Technical Notes:

• Manufactured from 319-T5 aluminum alloy
• High-efficiency combustion chambers
• Symmetrical intake and exhaust ports
• Angled spark plugs (14mm; 5/8" hex; " reach; taper-seat plugs)15 valve angle
• Bolt-down-type rocker arms
• Center-bolt valve cover hold-downs
• Fits Gen III and Gen IV Small-Blocks only*

LS6 Bare Cylinder Head

• 2.00" intake, and 1.55" exhaust
• 210cc cathedral port intake ports
• 70cc D-shaped exhaust ports
• 65cc combustion chambers