Heads question

[Turbo_smh]

Doing some looking. The ls6 243 heads with 64.4 combustion chamber, will bold to a 4.8? If they do, can they be milled down to the 4.8 61mm combustion chamber size for same cr?

I'm going off the fact of being able to get a set for cheap, if I can even find any

Would it even do any good?

Yes, they flow about 20cfm better, and can be milled about .020 to drop cc's to about 61. Just check manifold fitment when reinstalling.