ok im about to buy a set of gt40s for $300 and was just wondering if they were adjustable heads? Also was wondering because people are telling me the upper intake from an explorer iusnt as good as mines on my 89 gt 5.0 ho. Should i just do the lower intake from the explorer or what should i do? Any help is much appreciated, thanxxx

Adjustable heads as in adjustable rocker arms.....nope..... and Explorer intake set = Cobra Intake set.

the exploder intake is ALOT better than your stock intake... and if anyone tells you otherwise... kick them in the shin, and call them an idiot!

valvetrain on gt-40's = non adjustable and explorer = better than stock