About two years ago, I bought a bunch of parts to build a 1967 firebird. Some of the parts I bought as a package deal. The car is almost completed. The engine is completed. I have a set of 670 heads left over that was part of the "package deal". A few of the valves almost look like theres a crack from the outside of the valve straight to the center. Does anyone know what could cause this and are the heads possibly damaged?
Brent

If those are exhaust valves, they have been "burned." The heads are fine. New valves, a valve job and they can be as good as new.

On second thought - they must be junk. Send them to me, I'll disopse of them for you.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> On second thought - they must be junk. Send them to me, I'll disopse of them for you.
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Good 'ol Q, always willing to help a guy in need.

Kel

LMAO Aint he nice!!!

So I should probably get them Magnafluxed ,right?
Any idea as to the performance end on the heads, I mean are the better than the 6x heads i put on the 400 motor?
Brent

ALWAYS mag heads and blocks before you sink any money into them.

The term "better" heads is completely a matter of opinion. Pete McCarthy rated the 670 as one of the best flowing heads at low- to mid-lift.

My opinion: Personally, I really like them because you can open the chambers to match the style of the later ram-air heads and get them up to about 82-85 cc, which tends to be perfect on a 400. Add ram air length valves and port them to your heart's content, and you'd be hard pressed to find a better street head for a 400. The down side to 670's is that stupid A.I.R. boss built into the heads.