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Re: Bad Head Casting Numbers?
the differnce between 906 and 062 castings are teh 906 were used on work trucks they have like 15% less flow the exhause seats are hardend so you cant port them and they just dont flow nearly as good as a the 062's 062 were the proformance ones , altho the 906's are still good casting just not for all out proformance
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