I found a good deal on a 80mm MAF out of a Mark III and a set of 24lb Cobra injectors. I was wondering if they would work in my 1998 F150 4.6? I am running a 93 Octane tune through a SCT X4 tuner.

 

you need a custom tune for sure prior to installation (from a reputable tuner)

 

I don't see where either mod will help you do anything except empty your wallet. Stock maf and injectors are plenty sufficient till you start doing other heavy mods.

 

Thanks! Didn’t plan on spending a lot. The guy wants $199 for the MAF and injectors. I plan on getting some underdrive pulleys and then eventually get some new heads and cams. Thinking about port and polishing a set of junkyard PI heads or going with Trickflow.

 

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I hope you understand these motors are not like the old push rod motors and are a bit more complex.
I would plan out the end result instead of spending money on the 'deals' you think have come your way, peice by peice.
Heads are expensive, 2 cames are double the expense, intake manifold selection is not the greatest etc.
If you go with Trick Flow, the cams dial in differently than on stock heads because the valves have been relocated for better flow in the new castings.
Adding larger injectors and mass Air meter on a stock engine won't get you very much at this point. I feel the cost you gave is a bit on the high side for those parts if used.
We have a 4.6 SOHC built up to 400 + hp but have to wind it well over 7k rpm for competition and in dyno tune .
I don't think your would want to put up with that on the street in a 5500 lb truck that needs torque and a 3 speed OD tranamission..
You can't compare these engines to the old time ways of doing things.
If it were me, I would be thinking about a later truck with the double over head cammed 5L at close to 400 hp from the factory. Once you drive one it will change your mind about trying to build up an early motor to the same level. 2018 is 395, the 2020 are now 400 hp. 10 speeds and are in the low 14 second quarter mile for drag times in stock form.
Just passing some real life experience for you to think about.
Good luck.

 

I am not looking for a quarter mile race car. My truck only weighs 3850 and does pretty well with it’s 5 speed. I did notice quite a difference when I added the 75mm BBK throttle body and was told that PI heads would give me about 20-30 more ponies. I am also running 93 octane tune and really noticed the gains from that. I have looked into putting a late model Coyote motor in it, but don’t want to loose my manual shift. I have look throughout these forums and haven’t seen a way to marry the Coyote with a manual trans that will fit my truck.

 

You might be able to adapt a 6 speed Tremec out of a Mustang. Just a guess.

 

That lovable manual transmission you have now is not very strong.
Better get a couple spares for parts when you build up the power and use it.
The 4.6 we have built up has a 6 speed behind it and powers through 3:73 rear gear and performance after market locking differencial putting power to wide Housier Slicks in a 98 Mustang.
But ah, what do I know about it?

 

That’s what I have heard. I am running 3.73 gears now. I don’t race it, just like to have a little get up and when I need it. I am happy with it now. Just looking for a little more. The 93 tune woke it up quite a bit and the 75mm throttle body was good as well. I may just stop at the underdrive pulleys.

 

You may want to look at getting PI heads, cams, and manifolds. Fairly straightforward swap.

 

That’s what I was thinking. I am trying to decide on a junkyard crown Vic heads and paying for the port and polish or get a set of Trickflow heads?

 

why are you so hung up on the trick flow heads? for that cost you could just ad boost and see some real gains for the cost...

 

I plan on boosting eventually, but i want to wait until i do a complete rebuild. Right now I am just trying to let it breath a little better and give it a few more ponies for my daily drive. My question was which would be a better choice: to send a set of Crown Vic PI heads in to be ported and polished or spend the the money on a set of Trickflow heads.

 

are you talking about Romeo PI heads, Windsor PI heads? Obviously you need to do some more research before you get caught up in names of items and what cars they came off of because not all these parts are direct interchanges with your truck

Yes to take your motor your NPI motor (with flat top pistons it got in the factory) add swap over to PI heads ( obviously PI cams and PI intake manifold are part of the supporting modifications) Will be your best bang for the buck without adding boost


that will most likely also require you to run premium unleaded due to the compression ratio




Now you’re caught up on this port and polish as well, different shops charge different prices however not all shops are the same and you can pay money to somebody to do a “port and polish” and cause your hands to flow worse than they did in unmolested form

 

I'm not sure which part I missed. What I have gathered from this site is that I have a 4.6l Windsor block and can use either Windsor or Romeo heads. The only difference is the valve cover which I will harvest from the donor car. I heard that it is a lot easier to find Crown Vics to harvest the heads. I am already running a 93 octane tune and would love the added compression ratio. I just can't seem to find anything about the difference between a well built factory PI head and a Trickflow.