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Old 01-14-2013, 09:23 AM   #1
IIVIIoonshiner
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mercury cougar motor questions?

so I blew at least one head on my 302 several months ago and the truck has just been sitting. I have been debating doing something trick like a 4bt or just going back with a stock 302 or something inbetween.

I just got offered a free 5.0 from a 1987 mercury cougar xr7. less than 100k miles on car when wrecked sideways in a ditch.

my questions are...
1.how does this motor compare? same?
2.would yall put the longblock straight in and switch the stock stuff over to it or would you do a stroker setup or something cool?
3.I have another truck I'm driving right now... should i hold out for a frito truck to show up?

I realize that some of my questions are just for your opinions but I'm very undecided right now on what direction to head in. I do feel like a little extra power would be nice going up hill (my truck is not lifted) but maybe my motor was just tired....
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Old 01-14-2013, 09:25 AM   #2
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oh and my motor was over 200k fyi
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Old 01-14-2013, 11:04 AM   #3
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Old 01-14-2013, 11:13 AM   #4
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Quote:
Originally Posted by IIVIIoonshiner View Post
oh and my motor was over 200k fyi
Cool. :)

Me? For the least money I could, I'd swap parts and get it going.
No EEC or other hassles, I'd just have fun swapping parts. LOL :)
Knowing the whole time it'll run good, see? :)

Right after you get it bolted in, hit the key and go for a drive. ;)

As far as rings, bearings, valve guides/seals etc, check all that out
while you got it out, but if they're within spec... keep 'em.

There'll be plenty of future opportunities to take advantage of in
a whole different way?

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ps- Compression test it etc :)
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Old 01-14-2013, 11:31 AM   #5
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Bronco Info: 88 Bronco XLT, 5.0/AOD...the engine is a roller motor from a 91 Mustang GT
The long block is basically the same. Only real difference would be the cam (the Cougar should have had an HO, so it's a hydraulic roller with a bit more lift) and the pistons (HO's had TRW forged pistons). Swap the oil pan, pump, pickup, intake and exhaust manifolds and front accessories and ride. I just swapped an HO 5.0 from my 91 Mustang into my 88 Bronco and it runs great.

The stroker setup will end up costing quite a bit. Ballpark $800+ for the stroker kit, then machine work (boring the block, having the lower cylinder walls cut to clear the longer rods).....and you would still have a stroked short block with E7 heads, which would negate any hp gain from the increased displacement.
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Old 01-14-2013, 01:40 PM   #6
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The long block is basically the same.
Check the heads. They should be E7TE, but a few 86 E6TE heads could have slipped out in 87 on an H.O. engine.

If there E6 heads, well that brings up a few issues with engine mods. That and E6 Heads suck.
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Old 01-14-2013, 01:54 PM   #7
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Were all cougar motors HO or just certain ones? I grabbed a engine from a 86 cougar didnt check the model but its a roller engine. Just changed over my intake, carb, headers, valve covers and oil pan.
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Old 01-14-2013, 09:16 PM   #8
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He seemed to think it was not an ho motor
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Old 01-14-2013, 09:31 PM   #9
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Quote:
Originally Posted by 88bronc91stang View Post
The long block is basically the same. Only real difference would be the cam (the Cougar should have had an HO, so it's a hydraulic roller with a bit more lift) and the pistons (HO's had TRW forged pistons). Swap the oil pan, pump, pickup, intake and exhaust manifolds and front accessories and ride. I just swapped an HO 5.0 from my 91 Mustang into my 88 Bronco and it runs great.

The stroker setup will end up costing quite a bit. Ballpark $800+ for the stroker kit, then machine work (boring the block, having the lower cylinder walls cut to clear the longer rods).....and you would still have a stroked short block with E7 heads, which would negate any hp gain from the increased displacement.
87-88 cougar / t-bird had basically the same engine as the crown vic. Cast pistons, peanut cam, E6SE heads. It is not an HO
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Old 01-14-2013, 10:31 PM   #10
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Cast pistons, peanut cam, E6SE heads. It is not an HO
E6 heads are a problem. The heads suck, and the pistons are flat tops.

And your right it is E6SE, not E6TE. My bad.
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Old 01-15-2013, 09:11 AM   #11
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what was teh stock truck motor rated at? comparable hp? torque?

if the heads suck... which i believe you... will i notice on a stock truck or is that more likely to be a problem with lifts tires more hp etc?

also would it be better for me to find new heads for the motor I have and freshen it up? are there say mustang gt heads that are really beefy or some jazz?
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Old 01-16-2013, 09:36 AM   #12
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Quote:
Originally Posted by IIVIIoonshiner View Post
what was teh stock truck motor rated at? comparable hp? torque?

if the heads suck... which i believe you... will i notice on a stock truck or is that more likely to be a problem with lifts tires more hp etc?

also would it be better for me to find new heads for the motor I have and freshen it up? are there say mustang gt heads that are really beefy or some jazz?
can i get some thoughts on this before it gets too many pages back guys? thanks ever so much!
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Old 01-16-2013, 10:40 AM   #13
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take the engine from the mercury, Change the oil pump/pickup/pan front accessories, go get a set of GT40 heads from a junkyard if you can. Make sure it is all within spec and replace necessary seals/gaskets. If you can get a bassani or other better Y pipe and some headers. Probably the best bang for your buck, but the other guys on here can correct me if Im wrong. It would be nice to have a block to freshen up without decommissioning your ride.
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Old 01-16-2013, 05:23 PM   #14
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If you had the cash, look into a 4bt swap, they put out more torque, though not as much HP, but when your getting close to 30MPG I would rock it if I had the coin.
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Old 01-16-2013, 06:43 PM   #15
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I put a '90 Grand Marquee engine in my rig without too much issues. The one thing that I did run into is that the car's block did not have a provision for the knock sensor (just a freeze plug in it's place) I've been running without the knock sensor without issue and get no codes.

On performance wise, i think the engine from the Grand Marquee is rated only a few HP higher than the bronco (maybe only 5hp?) It is slow, but then again, most cars/trucks from the bronco's time period were slow/low HP anyways. I haven't noticed any gains or decrease in performance.
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Old 01-16-2013, 11:46 PM   #16
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You should prolly drill & tap the block for the knock sensor mate.
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