Cracks in valve seats!

[johana]

Hi!
I've got 3 pair of heads to my 350, -78 -85 -87, and all of them have one really small crack in at least one exhaust valve seat. Is this common? Is it recommended to put in some new seats? This truck is only for cruising. Everything on this 350 is std.

Need help and need to get this truck going soon!!!

/Johan, Blazer owner from Sweden who is planing on taking this truck down to Spain

 

[R72K5]

hum thats interesting ive never noticed cracks like that in any sbc heads over the years, what casting numbers are you referring to ? 624s ? 882s ?

hmm