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

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