Pair GM Chevrolet SBC Vintage Aluminum Cylinder Heads

Description

This listing is for a pair of GM aluminum SBC cylinder heads, probably from the 1960-1970 era.  This is a set of aluminum racing cylinder heads that GM started to offer during this time and are quit rare.
They are used and have been glass bead blasted.  Some of the intake manifold threads are damaged and probably should be helicoiled (1 thread on one head and 3 threads on the other).  One head has a damaged valve cover thread and needs to be welded/repaired.  Both heads have a chip on one of the water passages and needs to be welded/repaired.
Given the age of the heads, I would recommend helicoiling all the intake and exhaust threaded holes
The intake valve diameter is about 1.83" and the exhaust valve diameter is about 1.5"
There is a casting in each cylinder saying GM and then the number 0-426014.  Stamped on both ends of the cylinder heads are L/C-W and L/C-A.  On one head is stamped N8 and the other is N11
Weight of each head is 20 pounds
I was limited on the number of pictures I could load to eBay.  Email me if we want more detailed pictures showing the damaged threads and where the water jacket needs some welding/machining.