How to tell Gt40 vs Gt40p heads on explorer

Farmstad · Mar 11, 2023

I was just at a pick and pull today and found a really clean 5.0 explorer from 97. I want to know if it has the 40 or 40p heads I know you can tell from the stripes on the heads but I couldn’t see them with the accessories on. Have the vin and the door code and I didn’t see an egr but I am not sure. Hope some one can give a response so I can decide if I am going back tomorrow.

Kid wita 5oh · Mar 11, 2023

I can't answer you're question but either way they are worth pulling. The Ps are only slightly better in flow.. both are a decent upgrade especially if ported.

Farmstad · Mar 11, 2023

yea just wanted to get the regular 40’s just so I don’t have to get special headers.

AeroCoupe · Mar 11, 2023

96-97.5 are GT40
97.5 -98 are GT40P

https://lmr.com/products/what-are-gt40-heads-mustang

Based on the door tag says August of 96 so my guess would be three bar GT40’s.

Farmstad · Mar 11, 2023

How could you tell 96 from the door tag? The yard said 97 which could be wrong and the vin when I looked it up said 97.

Farmstad · Mar 11, 2023

Wait ya it does say 96 good eye

AeroCoupe · Mar 11, 2023

Just made sense as they typically release the new models in July or August of the year before the new model year. When does the manufacturer start making the next year model car? Usually a few months before the release date to have enough inventory to ship to dealers.

Farmstad · Mar 11, 2023

Exactly so hopefully it has the gt40 heads. Do you happen to know what the egr system on the 40 heads look like?

Farmstad · Mar 11, 2023

Been trying to look online. When I was at the yard I didn’t see anything that was connected from the headers to some place around the throttle body.

Farmstad · Mar 11, 2023

I have heard that the 40p have an internal egr compaired to the 40s

AeroCoupe · Mar 12, 2023

EGR is on the upper intake. You are lucky as only the 96 Explorers have the internal EGR passages like the stock Mustang intakes. You simply use the correct size EGR spacer to match your throttle body and hook it back up like it currently is on your car. This was a Google search that took less than 5 minutes.

Farmstad · Mar 12, 2023

Right it should have that middle hole like the intake on the right. And do you mean spacer like the trottle body one or the one with threads?

AeroCoupe · Mar 12, 2023

TB spacer has the provision to install the EGR on it so you will need that.

Farmstad · Mar 12, 2023

Oh I see. Ok I think I will pick the stuff up tomorrow only if it’s gt40 heads thanks for the help.

Mustang5L5 · Mar 13, 2023

That intake doesn't have the little "notch" that is in the neck of the non-EGR intakes. SO it's likely an earlier EGR version which would be nice to pick up as well even if not using the EGR

As to how to tell the heads on the motor, take a look at the front corner on the pass side.

Next to the spark plug, you'll see either GTP (40P) or GT (40) indicating which it is.

Also, behind the accessories (so tougher to see) are some cast bars. GT40 would be 3-bar heads, while GT40P are 4-bar heads

In addition to above markings. GT40P heads will have a "P" cast on the right side of the head near the valve cover, as shown here.

While GT40 heads will say "GT" in that spot

Finally, if you pop a valve cover off, GT40P heads say that under the VC

While GT40 say....GT40

Farmstad · Mar 13, 2023

Thanks. I did as much work as I could yesterday and found that they were egr because of the circular middle hole in the intake and I am 95% they are gt40 heads as I saw only 3 bars (5% error because I might be stupid and can count/ remember ha). I got couldn’t get it all off yesterday so I going back today for it and hopefully no one stole it from me. I am a little bummed out though because I realized I need to buy a elbow so that the explorer intake will work on my sn95 mustang… looked up the price and it was like $200 and I think that’s American doh: I am Canadian) so kinda sucks when I was trying to make cheap power.

Thanks again for all the help everyone.

96pushrod · Mar 14, 2023

If it turns over I’d probably just pull the whole engine.

Farmstad · Mar 14, 2023

Yea that was the plan originally but I wasn’t prepared enough. Got them pulled and sitting in the shop. Haven’t decided if I want to sell them or use them later on my car. Anyone know why they usually sell for

Mustang5L5 · Mar 14, 2023

All over the place. Fresh off the truck, $50-200 or so. Valve job and new springs, $400-600ish depending on level and quality of work/parts. GT40's will sell easier that 40P's and you might be able to get the higher end of that price range.

Canadian prices might be a bit higher as i'm quoting USD

Farmstad · Mar 14, 2023

Thanks that’s a good estimate to know. I was planning on heads cam intake swap on my 94 5.0 but I have heard the tunning on the stock computers aren’t fun so might sell the heads and intake down the road. I will have to find someone on the forms knowable about the 94-95 computers and how far you can get with them. If you know anyone @Mustang5L5 from moderating.

How to tell Gt40 vs Gt40p heads on explorer

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I'm definitely not in the original hole

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lube between the nut and the face. I know my lubes

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lube between the nut and the face. I know my lubes

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lube between the nut and the face. I know my lubes

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lube between the nut and the face. I know my lubes

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That is…until I whipped out my Bissell

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I think they're a little easier to get off

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That is…until I whipped out my Bissell

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