ive got a 92 F250 with a 351W that needs a pretty serious rebuild. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members)... i'd love to use these heads, but i hear there are clearance issues with headers ... i really wanted to use long tubes, but is there any header that will fit the heads and the chassis?

What would you recommend using for an intake?? i have the Explorer upper and lower ( i know the lower wont fit) ... and it seems Lightning intakes cost too much ... suggestions??

 

Go back thru the past posts, may be a week. there was a post with GT40P heads , shorty headers and 351w.
I think it is just the info you want.

 

check for that post in the 85 -96 150/350 F Series. Just remembered that part.

 

Edelbrock Performer(not the truck version) or the ProProducts Typhoon which is a Performer copy. But then it depends how you expect to use the motor and if you intend to change the cam or not, because it's not likely the stock EFI system can handle heads an intake and a cam. If you had to pick I'd suggest changing the heads and the cam and use the stock intake, because the stock cam really holds the motor back and this combo will produce the best truck power.. 0-4000rpm.

 

There really isn't any clearance issues, and as far as exhaust, headers for the gt-40P's are outrageously expensive. For a decent set, be prepared to pay $500. I'm just running the stock exhaust manifolds off of a 98 explorer and they seem to flow pretty well.

 

Ok, simple answer, look for headers for a first gen lightning. 93-95. They had the 351W with GT40 heads... should be no problem. I have never heard of this issue.... Maybe i just get lucky

 

GT40's and GT40P's have different spark plug angles ... hence why i didn't already just jump to that already. Guys over at NLOC already told me that they wont clear properly.

 

Any longtube header will fit GTPs however with a little "messaging" and 90deg plug boots, several guys here on this board have them and all that was required was to dimple a header tube or two for plug+boot clearance, most of the tubes clear well enough.

 

Yeah, the GT40P plug angle vs. the headers isn't NEARLY as big of a deal as some make it out to be. My experience has been that more off the shelf headers WILL fit with them than WILL NOT - so long as you have no aversion to dinging a tube or two. It's usually only a couple that interfere. Some that I've tried needed no mods at all.

 

Thank you sir, i much appreciate it.

Do you, or anyone else, have a suggestion for a long tube header for a 1992 f250 2wd with the 351W and automatic that wopuld fit with a minimum of tube dinging? im looking for something decent ... i only want to spend the money once ...

 

I have a thread over in the 87 to 96 forum asking this same question. https://www.ford-trucks.com/forums/1...d-headers.html

I am looking at the exact same thing here. Motor is a rollered out of a 95 3/4 ton and heads are off a 97 Explorer.

 

i decided to wake up this thread, as a new project has started.

I never ended up building the 351W, i went big block on that truck.

anyways, my 91 F150 with a 302 auto is giving me fits, it acts as if the head gaskets may have failed. a compression test will verify as soon as the weather warms up ( im currently driving a different truck).

Anyways, im thinking of plucking out the 302, to fix some lower end oil leaks, do the head gasket job, and some mother minor things to the engine. I look over to the GT40P's under the bench. the heads are coming off anyways....

So, i have a stock short block with 50,000 original miles on it, and i have these heads. to save money, i'd like to re use the factory truck intake, but i do have the factory mountaineer intake available as well if it would be helpful at all. i really cant see it being of huge help, seeing as it is a mass air setup.

so, without digging into the rotating assembly, what would you gents (and ladies, if you are reading) suggest to add a bit more power to this dialy driver with the parts i mentioned?

cam, headers, timing chain, have the heads gone through, and freshen up everything else? will i need to go and change anything in the computer??

 

A '91 truck motor could use a bit more cam, the stock unit is a small flat tappet but the block would accept a roller if you can source the parts, a complete 5.0HO roller cam assembly would be a nice upgrade and produce more HP, failing that the comp 35-512-8 would produce similar results.

The Explorer intake is a sideways step at best from the truck intake, it actually flows a bit less as it's squashed down to clear the hood but it gives you a single throttlebody which is easier to plump a MAF meter into.

 

The Explorer/Mountaineer upper intake has been tested to flow just as well as the tubular GT40 intake off the Cobra or Lightning. BC Broncos dot com sells an adapter for the Explorer Upper Intake to the 351W Lower. If the 351W upper flowed as well, I'm sure SVT wouldn't have bothered installing it on the Lightning.

 

Problem is.. the lower portion is the limiting factor with all of the OEM intakes.. including all the GT40 variants.