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That's not correct and I would not accept that "they have been building engine for XX amount of years and who are you to questions my experience" Bull crap.

#1 who cares what the installed height is ,if the valve length is wrong it will not work

#2 The intake is to long period .

#3 If they piled up the valve job so bad that the valve is .100 deep in the seat , they have no business selling heads. ( not to mention that you will have brutally bad air flow.