i am new to the mustang deal i bought what i was told are gt 40 heads they are iron heads not alum but what i want to now is how do i tell they are gt40 heads and not stock?.i now i am noob but what can ya do any info be much apprecited
GT-40 heads are easily identifyable by 3 raised lines on each end of the heads, also will
say GT on the lower ear on one end and not sure on all but mine say 44 on the opposite lower ear. But the quickest way is the raised lines on each end.