1BADASSLX

i was thinking about buy a set of gt40 heads will my headers of my e7te heads work on the gt40 heads there are 2 diff gt40 theres a gt40p & gt40 witch one do i want?

PX429

they will bolt up but then you are just restricting your heads. there is no point in doing it cause your forcing all that air into small exhaust ports

I3atR!ce

+1. look into aftermarket headers if your going to do a head swap.

1BADASSLX

i have inch and 5/8 headman headers i was just hopeing thay would fit bolt pattern

r.barn

there are more than 2 kinds

GT-40 = old cast iron head, not much better than stock
GT-40P = came off explorers, little better than reg. GT40, problems with spark plugs and headers
GT-40X = $1000 aluminum head, MUCH better then stock.
GT-40Y = similar to GT40X just not as good
GT-40Z = aluminum race head

P's are ok, but can be a pain in the *** to match headers to.

www.thumperoforangepark.com has some nice ported heads that
flow with GT-40X heads for like $600

r.barn

it's the shape of the header that matters on the P's
the spark plugs get in the way on some headers, some work some dont.

Dath

The sales pitch at Thumper claims they can make stock E7TEs 'out perform out-of-the-box GT40 series' heads. I doubt they mean the aluminum y303 or the x303 GT-40's. And if they did, I wouldn't believe it. It would be shocking enough if they could get those boat anchors to flow as good as the GT-40 Iron or GT-40P without melting them down and re-casting.

5.0 MPG

read this on the GT 40 P's

https://mustangforums.com/m_1670002/...tm.htm#1672819