Quote Originally Posted by tango
I did think I could do this because I had a set of #186 fuelly heads that were re-done Well I marked and removed all the Valves to do some pocket porting . And what did I find ? When the machine shop in-stalled steel valveguides . They cracked just about every guide boss They ruined a good set of fuelly heads with the front bolt holes . And they put them together that way I don't know what shop did this . They came off a 355 rebuilt never run engine.
when they put in new guides they drill out the old and press in new. you should call and talk to someone at a machine shop to find out if those heads are really ruined.