jonnyslick

what's the difference in GT-40's, GT-40P, and GT-40X heads ?? are they other GT-40 heads? some are aluminum and others are iron right?

[>:]

meiguoren33

I just ordered a set of GT40P heads. From what I gather, the GT-40X heads flow the best then the GT40P, and lastly the GT40. The GT40 and GT40P are iron Exploder heads. The GT40P lacks thermactor ports or something and requires special headers due to an angled spark plug.

clienterror

GT-40X are P's that just have turbo swirl or wtf its called and stock CR, their the Best

GT-40P's are aluminum that require a special header (some fit some dont) due to angled spark plug ports. Stock CR as well

GT-40 Irons lower your CR by i think about .5 CR but I beleive their actually stronger than P's due to iron vs aluminum. They can use any header as well.

P's and irons flow pretty close goto this link it explains GT-40 specs

Irons would also be good for Nitrous, S/C or turbo set up if you didnt want to get a more brand name head and save cash (AFR,Trickflow....ect)

meiguoren33

In the graph it says GT40P "iron". I'm not questioning just asking, are the P's iron or Aluminum?

jonnyslick

cool thanks guys... [8D]

clienterror

Im thinking the newer GT-40P's on Exploders are aluminum, Im not sure if they made P's that were iron, I never noticed that on there before. Always accepted they were aluminum lol.