Help on determining value of 842 heads.

[Zman1969]

Rick, I bought mis-matched pair a 392 and a 842 that have had some mild porting had O-ring grooves repaired - had my machinist look at them and he said they had some nice machine work done to them by P/O with a $900 receipt from reputable shop in Austin that were still fresh from his shop done in 08 and have been stored since and were dusty unknown springs so we swapped springs paid $2600 for these numbers don't matter for me