, being that the last few years, I've become much more of a late model v8 guy than an early model, my knoweledge of the earlier heads/blocks is limited in comparison to what I know of the later stuff. Many people don't know, but the gt40 and gt40p heads came on every single v8 ford explorer that left the line between 96 and 2001, as well as all 93-95 cobras, and the first generation ford lightenings For this reason, I considered it a stock mass produced factory head, (and is actually "fairly" easy to find, except tha the mustang guys have been gobbeling them up like crazy) hence my arguement Great head, but I wish I had the dough for a real aluminum head, whole different ballgame there.
So what you are saying is. If i go to my autosalvage and find a V8 96 ford explorer that it would have GT 40 heads, and i could get them rebuilt???? cause i am perty sure that my cam is about the same sized cam that goes to an explorer. What about an Expedition, would they have GT 40s
Here's a set of roush 200's on ebay for a fair buy it now price. http://cgi.ebay.com/ebaymotors/Ford-Roush-200-Heads_W0QQitemZ300009262029QQihZ020QQcategoryZ107063QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
many explorers were rollovers, and have low miles, may not need a rebuild. 1996 5.0 explorers have the gt40 head EARLY 1997 5.0 explorers have the gt40 heads mid 1997 -2001 explorers all have the gt40p heads. 96-01 has the efi intake that flows almost identical to a cobra manifold if you're into efi. IF you have to adhere to the egr laws (in a late model fox, etc, then only the 96 and early 97 intakes have the internal egr ports. 97-01 aren't set up to run the right egr system. the explorer cam is a truck cam. Lots of torque, but doesn't make much hp above 5k. not suitable in a performance application. Additionally, the valve springs are matched to the cam, and may float above 5k. these motors have hypereutechtic pistons, which are ok, but not super for boost. sorry about the info overload..my bro and I have both dropped explorer 5.0's into our mustangs.
the gt40p is a great head. Smaller valves, by a little, but excellent velocity. In fact, it will make more power than the regular g40 head stock for stock. Watch out on porting and polishing though, as this head was designed well, and it could actually hurt your performance. This head was designed to produce better emissions, and wound up with a slight power increase too. Major drawback is the angle of the spark plugs. It's completely different, and necessitates special headers. this can make for quite a clearance issue in the maverick. search gt40p head and headers on this forum, and you'll see what others have done to make headers work for this head on their mav. really, the two are so close to each other, I'd grab either, no biggie. Perhaps swayed a little towards the gt40's, because headers are easier, though I'm running the gt40p's in my 86 stang
me? i've got a 97 explorer 5.0 in my 86 mustang with the gt40p heads My maverick engine that I'm putting together is a rebuilt 86 roller shortblock with keithblack pistons, and so far ported e7's, though I may skip those if I can find a local deal on some gt40/gt40p heads
On the p heads, any header that we normally use will fit, but you will need a combination of one or more of a spacer at the header, shorty plugs, 90 degree hei-type boots, and spark plug boot heat protectors (those slip on fiberglass sock-looking things). And, again, this is only for the driver side. There are no clearance issues on the passenger side. You will still need to loosen your header bolts and pull back the header to remove those plugs. A little hassle the first time you do it, but after doing it a couple times, I can swap the plugs in about 20 minutes.
76' sorry for being gone, my internet is down and i am at a friends, its seems like a nightmare being gone
Jeremy, once you get the dough and get some good quality aluminum aftermarkets, you will chuckle at all the messing around you did with heads that had a Ford logo on them! Aluminum aftermarket heads changed my life. I am trimmer, girls talk to me, I can do crossword puzzles in half the time....you get the idea.
Hey man, I couldn't agree more. Unfortunately, I chose to do a megabuck resto on the mav, a complete mechanical resto of my 86 vert including new drivetrain, and slight mods to my 91 bronco. Perhaps when the dust settles, the stang is running, and I've run my slew of 13's, I'll be ready for some aluminum
