What size heads for LS3?
The LS3 is a Gen. 4, 6.2L small block engine used in GM performance cars between 2009 and 2017.
LS3 Cylinder Heads.
|LS3 Cylinder Head Specs|
|Exhaust Runner Volume||87cc|
|Intake Valve Diameter||2.165 in.|
|Exhaust Valve Diameter||1.590 in.|
How much HP can a cammed LS3 make?
You can get very close to 500rwhp out of an LS3 with a camshaft that has "near stock" driving manners IF the builder knows what he's doing. Internet marketing, internet hype, and pure misinformation will have you believing you need a $2000 set of heads, $1500 worth if intake / throttle body, and huge cam to make power. via
What are 0821 heads?
The cast number is 0821. This is a drivers side and passenger side head and are good pull-off heads. They have good valves and springs. They come just as seen with rocker arms. via