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Discussion Starter #1
I was just wondering if the performance parts for a 4.6l mustang were interchangeable with the 4.6l cougar/thunderbird. Some people tell me they are but others say that they are not. Who's right?
 

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Both. From what I understand, most Mustang bolt-ons will work on the Thunderbird/Cougar/Mark VIII engines. The only thing I can think of off the top of my head that won't work are most (if not all) Mustang headers. This also depends on what year you have and what parts you are thinking of. What parts do you have in mind?
 

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Some of them will, some of them won't. Like 95greenbird said, headers will not work. The only ones worth buying for a 4.6L MN12 are the Kook's headers. Underdrive pulleys, throttle bodies, intake manifolds, heads, and cams will work, though with the cams you can't go quite as aggressive as a Mustang owner could, since you need to keep enough vacuum to run your power brakes.
 

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Discussion Starter #4
I was thinking of changing the heads out, and putting a centrifugal supercharger on it in the future. Also the intake manifold I heard that the manifold's were not all that great. I just can't find parts a 97 cougar I always see mustang part's.
 

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The manifold you have is known as an NPI manifold. It's ok, but not great, as you said. The good news is that there is a cheap alternative - the PI manifold. Mustangs from 99 and on are equipped with a PI intake manifold, heads, and cams. Installing these on your car will improve power by 30-40 hp. They flow better than stock PI heads, and boost your compression a little bit, which isn't exactly great if you're going to supercharge, but it'll only cost you around $500 or so - not a bad deal.
 

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Discussion Starter #6
You may think this is a stupid question but why isn't it exactly great if if I am going to put a supercharge on.
 

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The higher your compression the less boost you can safely run. That is why.
 

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Discussion Starter #8
Where is the best place to get a PI intake manifold, heads, and cams?
 

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The For Sale section here, ModularDepot.com, and other Mustang sites may have some used ones for sale. If you want new, here is a sticky for "Most Common Parts" that shows the prices for the pieces (you may or may not need all of them) you need and get them new from Dan Newman. You can call him at the 800 number in this sticky. There is also a tech article here on how to do the swap. Just be carefull. If you get them used, I think there are two versions of the PI intakes. One that has a plastic crossover and a newer one that has a metal crossover (just like the NPIs). Get the one with the metal crossover. I may be wrong though.
 

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Discussion Starter #10
ok Thank's, if you can't tell I'm trying to learn more and add more to my car. Without damaging any of the internal parts. If I put the PI head's and intake could I still put a supercharger on it later?
 

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You would just have to keep the boost low with the SC. Something like 6-8 pounds it should be ok with. It'll blow up at 12 psi I can pretty much guarantee (friend of mine (Mr. 1320video) blew up his turbo Mustang).
 

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Yes you can but any time you had a supercharger (or any power adder) to stock internals, you play Russian Roulette with it. As long as your current internals are healthy and you don't go boosthappy, you should be OK for a while. Just keep the boost to around 6-10psi. If you want to go higher than that, get a new shortblock with forged internals.

97qwikcat said:
ok Thank's, if you can't tell I'm trying to learn more and add more to my car. Without damaging any of the internal parts. If I put the PI head's and intake could I still put a supercharger on it later?
 

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Discussion Starter #13
yeah I wasn't planning on going any higher that 9 psi. Soon as I can save the money I will be adding this stuff. Hopefully it will be this summer !!!
 

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If you can afford it, build a shortblock with forged rods and pistons. Unless you're going to go crazy with the boost, you should be fine with the stock crank - I haven't heard of many of those breaking. The weak links are the tiny toothpick connecting rods and the weak hypereutectic pistons.
 

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Another option is just swapping in a PI motor. The compression on a PI motor is a little less than an NPI motor with PI heads. The Explorer engine is a popular choice, since it's an aluminum block you also save a bit of weight on the front end, which is never a bad thing. It might end up being only a little more than the PI headswap.
 

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Discussion Starter #16
I will probably just rebuild the block and use forged piston's and rod's. I have to pull the motor out in the future anyway, I got underneath it yesterday and noticed the block had alot of rust on it. I hate rust!!!!!
 

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97qwikcat said:
I got underneath it yesterday and noticed the block had alot of rust on it. I hate rust!!!!!
Then you might not want to look around to much under the car next time or you will replacing everything.
 

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lol, I know what you mean. As soon as this semester ends, I'm tearing my car down completely, and removing as much of the undercoating (and rust) as possible, and getting my T-bird nice and clean from top to bottom.
 

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Discussion Starter #19
T-bird_fan said:
Then you might not want to look around to much under the car next time or you will replacing everything.
Thank's I will remember that next time!!! LOL
 
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