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Old May 12, 2022 | 07:54 PM
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GT40 Heads

Will the GT40 5.0L heads fit a 5.7L or are they displacement specific?
 
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Old May 12, 2022 | 08:11 PM
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Originally Posted by dzimbric
Will the GT40 5.0L heads fit a 5.7L
No... but they will fit a Ford 5.8L.

 
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Old May 12, 2022 | 08:32 PM
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thanks. Didn't want to buy something I can't use.
 
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Old May 12, 2022 | 09:36 PM
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Originally Posted by dzimbric
thanks. Didn't want to buy something I can't use.
Two different head bolt sizes: 7/16” on a 302/5.0L ; 1/2” on a 351W/ 5.8L. What size are the holes in the heads you are looking at buying?
 
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Old May 12, 2022 | 09:56 PM
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Originally Posted by dzimbric
thanks. Didn't want to buy something I can't use.
You have a 1993 F-250 Regular Cab 5.7 4R70W 4WD??
 
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Old May 13, 2022 | 10:23 AM
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Originally Posted by wwhite
You have a 1993 F-250 Regular Cab 5.7 4R70W 4WD??
No I guess I have a 1993 5.8L. I picked up a cubic inch and without pulling engine.
 
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Old May 13, 2022 | 10:31 AM
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Chebbies & their BOP GM bretheren are 350s & 5.7s

Ford 351 products are 5.8
 
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Old May 13, 2022 | 11:58 AM
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Can I bore the 5.0 head with 7/16 studs out to accept the 1/2 studs for a 5.8? I see a lot of 5.0 heads for sale on e-bay and have also spotted some potential ones at the PickNpull.
 
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Old May 13, 2022 | 12:08 PM
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Yes you can drill the 7/16 head-bolt holes out to half.

The pair I salvaged off an unmolested explorer had 7/16 on one side & 1/2 on the other.

You can see a dif in sizes if you look cross-eyed.

Had 3 different kind of seals too.


 
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Old May 13, 2022 | 12:11 PM
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That's wild, were the studs different or just the bores?

Did you change your cam when you swapped heads?
 
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Old May 13, 2022 | 12:37 PM
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Originally Posted by dzimbric
That's wild, were the studs different or just the bores?

Did you change your cam when you swapped heads?
To use 351W heads on a 302 there are bushings that go under the bolt head to compensate for the larger hole in the head.


…and no you didn’t “pick up a cubic inch”. You finally realized that you have a Ford engine and not a GM.

I am wondering about the transmission in your 3/4T truck. I didn’t think Ford put the 4R70W in anything larger than a F-150 but I could be wrong.
 
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Old May 13, 2022 | 01:26 PM
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I have the Sterling rear end and a big front axle so who knows, what are my options and how can I tell them apart?
Tranny is 4 speed automatic with overdrive
 
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Old May 13, 2022 | 02:35 PM
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Originally Posted by dzimbric
That's wild, were the studs different or just the bores?

Did you change your cam when you swapped heads?
No, on the donor 5.0 the head bolts were both sides 7/16. Just one head was drilled for 1/2. (I'm sure they had a few left over heads for 5.8 Lightings in 96)

There were no additional washers or spacers to center the 7/16 bolts on the ones drilled 1/2

The "locating dowels" on a SBF block & heads are the same & will pass the larger bolt/stud.

I used a very mild Comp cams 512 & Crane "Ford Racing Cobra" bolt down 1.7 rockers for a tad additional lift.
 
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Old May 13, 2022 | 05:37 PM
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The axles have nothing to do with what transmission is in the truck. Both the ‘87 and ‘94 Broncos had a 5.0L engine, Dana 44 front axle and Ford 8.8 rear axle. The ‘87 had a C6 while the ‘94 had an E4OD. What is the transmission code on the driver’s side “B” pillar? Look under the truck. With the exception of the upper left picture which is not applicable for a full size truck, does the transmission pan look like one of these?

 
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Old May 13, 2022 | 05:41 PM
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Originally Posted by dzimbric
I have the Sterling rear end and a big front axle so who knows, what are my options and how can I tell them apart?
Tranny is 4 speed automatic with overdrive
Most likely to be an E4OD. What is the trans code on the decal on the drivers door pillar? Code E = E4OD.
 
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