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The only problem with toluene is that it will KILL you. This stuff is highly toxic. Look it up.

Thanks for your input. I dom't think it was anything I did when I changed the springs. Changed the locks and retainers at the same time. Valve spring heights were ok. Besides, if something was wrong from the start I don't think it would have lasted for 50 plus passes (1/4 mile) and at least 100...

Has anybody out there had any problems with these heads? I put a set on my car this year with good and bad results. The motor is, was a 383 with 12.5:1 compression, .590/312 purple shaft cam, edelbrock victor intake. All I did to the heads was change the springs and opened up the pushrod holes...