The iron vs aluminum cylinder head argument is over.

j par said

What do you think the valves that come in those heads are made out of?.. I'm not understanding their extreme inferiority..

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Guides are all over the place on clearances. Cheap seat inserts. Cheap valves. Some guys have found a wide variance in spring height due to poor QC on spring pockets and even rocker shaft mounts. True you may find a good set but these are being set-up by $9.00 an hour workers in a fast paced environment where production is more important than good work.

Lots more complaints on their Chevy stuff but they sell a ton more, too.

Sorry guys but I could never pull the trigger on anything Speedmaster. Just because it LOOKS the same as a quality part doesn't mean it IS the same.

I know guys who buy bare heads and fix what isn't right. But you spend hundreds to buy good parts and machine what isn't correct.

Will they work OOTB? Yep...if you don't care about quality.