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Old 02-14-2008, 02:04 PM   #1 (permalink)
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Have a 91 302 0.30 e303 cam, hydralic roller lifters, double timing chain that I recently purchased. I'm looking to buy a set of GT40 heads from a 94 GT HO, I'm on a very tight budget. I plan on buying a dual plane intake and 600 Holley carb along with shorty headers. My question to all of you, is this a good combo to hit 285-300 hp.
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Old 02-14-2008, 02:23 PM   #2 (permalink)
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We're the GT40 heads ADDED to the '94 GT? I ask because they were not production parts on the '94, only the '93 Cobra and the 5.0 Explorers.

The GT40 heads, if they are the "P" head, will require different headers due to the spark plug angle...

With iron GT40s and an E303 you're looking at the bottom of your hp range. 275-280 or so...
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Old 02-14-2008, 02:28 PM   #3 (permalink)
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The guy that I'm thinking of purchasing them from is taking pictures and sending them to me. Did 94 GT HO come with gt40 heads?
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Old 02-14-2008, 02:29 PM   #4 (permalink)
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#1 - The '94 GT did not have GT40 heads (The 5.0 HO is the standard engine in the GT). The heads on the GT HO are exactly the same as the heads that came stock on a '91. The GT40 heads were only oem on the Cobra 5.0 and early Explorer 5.0.

#2 - comparing stock to stock, the GT40 heads are worth maybe 20 HP over normal 5.0 heads (E7TE castings), 25 at most. Combined with the E303 cam you'll probably be in the 275-300HP range at the flywheel if you get the carb dialed in properly on a Stealth or RPM intake.

#3 - Even if the '94 heads you're looking at are from a Cobra, they are 14 years old and probably need some freshening. Look for burnt or bent valves, recessed seats, and/or nicks in the sealing area of both the seats and valves. You might be able to get away with just a 3 angle valve job and bolt them on. Depending on how much you pay for the heads, adding any more work to them will probably bring the cost close to aftermarket head prices which are much better than any variety of Ford iron heads (except for the N351 NASCAR heads sold only thru FRPP).
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Old 02-14-2008, 02:33 PM   #5 (permalink)
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Thanks, I'll see what the pics bring. I've will probably just buy a set of World Jr's.
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Old 02-14-2008, 02:43 PM   #6 (permalink)
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Other things to look for in the pics, production GT40 heads have an F3 casting number, and when looking at the end of the head where the accessory bolt holes are there will be 3 vertical bars in the lower corner for a GT40, 4 bars for a GT40P
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Old 02-14-2008, 02:45 PM   #7 (permalink)
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Thanks I'll certainly look for the bars.
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Old 02-14-2008, 08:21 PM   #8 (permalink)
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GT40 heads will also have a GT raised up in the casting in the front corners of the heads. You can see the GT casting before you even take the valve covers off. I installed a set of 93 Cobra heads on my wifes car and it made a huge difference in seat of the pants performance. The 93 Cobra GT 40 heads were cut .040 before Ford ever installed them on the car. Here is a picture of the GT casting, a little hard to see but its right next to the spark plugs.
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Old 02-15-2008, 12:36 AM   #9 (permalink)
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Quote:
Originally Posted by Daf
The guy that I'm thinking of purchasing them from is taking pictures and sending them to me. Did 94 GT HO come with gt40 heads?

The GT came with the stock "E7" heads. The 93, 94 and 95 Cobras got GT40 heads. So did the 96 Explorer.
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Old 02-15-2008, 11:51 AM   #10 (permalink)
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93-95 Lightning also got the GT40 heads.
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