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.
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LS3 Cylinder Heads.

LS3 Cylinder Head Specs
Exhaust Runner Volume 87cc
Intake Valve Diameter 2.165 in.
Exhaust Valve Diameter 1.590 in.

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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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