I just had my heads rebuilt on a 1990 TA GTA with a 305. Any advice on breaking them in? I know with a full engine rebuild you have to be somewhat careful, vary rmp's, take short trips and let the engine cool off, etc. Same deal for just the heads? Do I have to check and re-torque the head bolts after a few hundred miles?

Or since it's just the heads, I don't need to worry so much? I've seen conflicting advice on the internet and figured I'd see what this forum's wisdom had to say on the subject.

 

If you're using a composite head gasket, your done. If you used a steel shim head gasket like original OEM, you'll need to retorque the head bolds once.

Other than that, there's nothing to break in on heads.

 

Alky, I have to respectfully disagree with the need for re-torquing steel shim head gaskets. No relaxation of bolt preload with those. Some specialty gaskets require retorquing; however, unless L-train went out of his way to find an uncommon replacement gasket, retorquing wouldn't be needed.
As was said, no break-in required for heads.