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Author Topic: motor decision for my 86 cougar  (Read 1994 times)

cougardoc

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motor decision for my 86 cougar
« on: March 15, 2008, 04:36:29 PM »
I have a Gray 86 Cougar with mint body and interior but the original 3.8 with 138,000 has seen better days. So I am going to change the motor out but can't decide on what motor to put in :schh:. The motors I have sitting around 289, 302 HO, 351 c, 351w, 351m, 390, 429, and a 460 not concerned if fuel injected or carb. What ever motor I go with will not be rebuilt stock :flex: so I am asking for input on what motor to use. :help:

I have to convert to 5 lug anyway and will be going with a 8.8 with 3:73 gears
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J dot Miller

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Re: motor decision for my 86 cougar
« Reply #1 on: March 17, 2008, 06:08:34 AM »
A 460 would be cool!   :o

What are the transmission plans?  :-X
The 5.4 swap has been called a bad idea, and considered an underpowered considerable waste of time, since 2007.

Nice to see that most donít think that anymore.
Bondfreak13 07/28/09 09:05 PM

cougardoc

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Re: motor decision for my 86 cougar
« Reply #2 on: March 17, 2008, 09:17:39 AM »
Manual either a 5 or 6 speed. The body would need heavy modifaction , more than subframe conectors to the handel the twist of a big block wouldn't it?
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FASTFREDDIE

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Re: motor decision for my 86 cougar
« Reply #3 on: March 17, 2008, 01:01:38 PM »
I SAW A 460 SWAP IN A FOX BODY 88  :flex: IT SHOULD NOT BE A PROBLEM ..BUT SEE WHICH ONE GIVES YOU THE BEST BANG FOR THE BUCK  ;D AS UP GRADES GO   :first: A 5.0 CAN BE CHEAPLY DONE :afit:  CHECK THE YRS 88 UP AS IT HAD A ROLLER CAM AND FORGED PISTONS  :first: ALSO HEADS FOR FLOW AND CC,S FOR COMPRESSION  :king:A 351 STOKER CAN BE GOOD  AS WELL TAKE YOUR TIME TO SEE WHAT WAY TO GO BUY USED STUFF HEADS, CARB, HEADERS ETC O0 THEN YOU CAN MAKE THE MOTOR SWAP!!!!!!!!! :hide:
LETS GO CRUISING!!!!

KevSha

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Re: motor decision for my 86 cougar
« Reply #4 on: March 17, 2008, 04:46:02 PM »
Well, personally i would recommend the 5.0 HO swap. i had a 88 with the swap. its not hard to do, it fits right in and there is obviously a HUGE after market following for them...

as for the trans, you said a 5-speed, so you were thinking a T-5? if you put a 3.73 rear in there then you won't even need first gear unless your towing...might think about staying a but lower, like 3.27. especially if you use a 4cyl T-5 or a T-5z. in my 88  XR7 with the T-5 and stock gears first gear was really short....

either way, i recommend fuel injection...but if you are going to go nuts with a big motor.....hows about a 5.4 DOHC :bow1: instead of a 460???

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1990 Thunderbird Soupercoupe
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cougardoc

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Re: motor decision for my 86 cougar
« Reply #5 on: March 18, 2008, 01:12:31 AM »
I was leaning towards the cobra-r ,or the t56 Tremec. Fuel injection is no problem as I have a 5.0 from a 88 lsc with computer. A 5.4 doc isn't a real option as I already have the motors listed above in my garage and don't want to go and get another motor but then again it would go with my handel "cougar doc". The 5.0 is a real common swap and was thinking something a little different.  I have 1 question were do I start such a swap?
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KevSha

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Re: motor decision for my 86 cougar
« Reply #6 on: March 18, 2008, 02:18:06 PM »
3:73 will be too much gear for the t56 i think. as for were to start, rip all the old stuff out...
96 Thunderbird LX 3.8
170k
new head gaskets
daily driver

1990 Thunderbird Soupercoupe
103k miles
black on black

cougardoc

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Re: motor decision for my 86 cougar
« Reply #7 on: March 19, 2008, 12:18:22 AM »
The old stuff is already moving out. :afto2:  Where can I get info on the 5.4 ? >:D Is that a bored out 4.6l?
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rjstat

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Re: motor decision for my 86 cougar
« Reply #8 on: March 19, 2008, 12:06:59 PM »
The deck hight is taller and the stroke is longer other wise the bore is the same. Heads are interchangeable
 2v, 3v, or 4v the timing chain cover and intake manifolds are different for the 5.4l than the 4.6l
97 - 4.6L Alpine Green Cougar XR-7 w/ Fiber Concepts Hood, SPC cold air intake, 2.5 SLP Dual Exhaust, Eclipse CD4000 w/ Polk's speakers, Koni Shocks, 11/4" Addco sway bars, and Vogtland more to come.
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cougardoc

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Re: motor decision for my 86 cougar
« Reply #9 on: March 19, 2008, 11:54:33 PM »
I never heard of this motor, Is there any where I can read up on it and to see what is involved in the swap?
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J dot Miller

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Re: motor decision for my 86 cougar
« Reply #10 on: March 20, 2008, 06:09:32 AM »
I never heard of this motor, Is there any where I can read up on it and to see what is involved in the swap?

Yes. I have that motor in my Cougar.  You can read all you desire at my home web page here:

http://www.eastcoastrollingthunder.com/jmiller/54.htm
 8)
The 5.4 swap has been called a bad idea, and considered an underpowered considerable waste of time, since 2007.

Nice to see that most donít think that anymore.
Bondfreak13 07/28/09 09:05 PM

KevSha

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Re: motor decision for my 86 cougar
« Reply #11 on: March 20, 2008, 11:04:19 AM »
well, the 5.4 would be a different swap for a fox body, bang for the buck your better off with the 5.0 or the 5.8(351). the 5.4DOHC motor will not fit without heavy modification and is an expensive swap... and the SOCH motors offer no rear advantage over the 5.0 or 5.8 swap
96 Thunderbird LX 3.8
170k
new head gaskets
daily driver

1990 Thunderbird Soupercoupe
103k miles
black on black

cougardoc

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Re: motor decision for my 86 cougar
« Reply #12 on: March 21, 2008, 12:26:01 AM »
It is a stock 4.6 block right?  Does anyone know where I can get a block (plastic or real) for for mock up?
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J dot Miller

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Re: motor decision for my 86 cougar
« Reply #13 on: March 21, 2008, 06:18:20 AM »
The 5.4L is best for 94+ MN12's.  The easiest and best way to get speed in an 80's is with an older engine.  The block is not the same as the 4.6L block.  You would need a 5.4L block.  Some have taken 4.6L blocks and bored/ sleeved them to 5.0L's.  Nevertheless, at Harry's they have engine sales where you can get one around $65 or less...  Here is a link:  http://www.wegotused.com/

 :afto2:
The 5.4 swap has been called a bad idea, and considered an underpowered considerable waste of time, since 2007.

Nice to see that most donít think that anymore.
Bondfreak13 07/28/09 09:05 PM

cougardoc

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Re: motor decision for my 86 cougar
« Reply #14 on: March 21, 2008, 11:36:52 AM »
The 5.0 is an easy swap but to common looking for something different, besides I have too many cars with 5.0's and 351's in them already I even have a 76 Cougar with a factory 460. I goto Harry's in Hazelton offten but have yet to see anything with a 4.6 what did the 5.4 come in, truck or expedition I am guessing? I ran into a guy that is willing to take me to the dealer auctions if I can find something cheap I will grab it just for the motor and electronics.
to many toys not enough time