[74Grandville]

looks like a small chamber, i'm guessing a valuable number like 12 or 48.

[gtofreek]

I have fixed many cracked heads using repair pins like what was done here. Most crack repair pins are tapered and try to spread the crack apart, so it is very important to start the first two pins out past the end of the crack to be sure the ends are completely gone before the rest of the crack is repaired. They generally work good, but for $2900 I would pass also.

The better repair pins are straight, and have threads that are shaped in a way that pulls each half of the crack together. The tighter you tighten the pins[until they break off] the tighter it pulls the crack together. These pins are made by Lock-N-Stitch. Much better system for crack repair.

[b-man]

Originally Posted by 74Grandville

looks like a small chamber, i'm guessing a valuable number like 12 or 48.

The repaired head pictured is actually a far more valuable #614 1970 RAIV head.

Comparison of 1969 -'70 RAIV chamber (top) and common high-compression '68 -'70 D-port (bottom). They're actually quite different.

Pictured here are a 1969 #722 RAIV 400 head and a 1970 #13 400 head.

[steve25]

Believe it or not, the D port heads have a better burn rate since the plug is not sunk down into the chamber roof!
The RA4 chamber does better with dome Pistons .

[rtanner]

Originally Posted by 61-63

That head appears to have been pinned, not welded. Either way if done by someone who knows what they were doing the head would be fine.

Google "pinned crack block" and read up on what was done to that head. Or here is a link which describes it

http://www.enginebuildermag.com/2015...d-head-repair/

I agree, a couple of ww2 sailors, taught me the pinning process, which they learned as machinists mates, that repair is fine, still id want em cheap and id have no problem running em, if you pass on them, would you pm me the seller info, I would be a buyer on them, thanks Ronnie