Engine Donor '00 Mountaineer meet '91 Fox

AeroCoupe · May 16, 2026

And so are 30’s.

91firecracker · May 16, 2026

AeroCoupe said:
Most 302’s with GT40 heads, Explorer upper & lower, and a decent cam will make 300+ hp at the crank. Ran three different injector size calculators and at 85% duty cycle you need 24’s or larger.

Can 19’s be used? Sho nuff but you can wipe your butt with 200 grit vs toilet paper too.

If it’s all you have send it but why would a person go too all the trouble of doing a HCI swap and then not put the correct supporting parts on it? It’s the old saying of 302 parts on a 351 make 302 power.

Understood. Appreciate ya'lls insight.
I will probably end up picking up 24's or better with matching MAF. Anybody got something laying around you wanna get rid of?!?

86HO5.0 · May 16, 2026

FWIW--I was running Explorer 19lb injectors when I was seeing 100% D.C at 4900rpm. 24's would be a very wise decision.

91firecracker · May 16, 2026

Maybe a stupid question but can you go too big with injectors/MAF? Like go with 30's over 24's.

86HO5.0 · May 16, 2026

30's would be fine. It also gives room to grow in the future, buy once, cry once.

JD1964 · May 17, 2026

The main bottle neck when running stock foxbody 19’s is actually the stock 55mm MAF, not the injectors. Theres a plug and play 70mm MAF upgrade that is cheap to do. I had done it on mine using a 94 Marquis MAF. Things have changed since then but at the time, that MAF swap along with my stock Mustang 19’s worked very well. It easily supported my 302 with Explorer heads, intake, Explorer 65mm TB, headers, and 1.6 rockers. That setup pulled strong to 6k rpm no problem.

Check this thread for more details, especially post #2.

Post in thread 'Maf Suggestions'

Jun 20, 2016

stykthyn said:
What the what???? Sn maf shouldn't be more than 50 bucks from ANY jy.

10-4. I'm not running it anymore but I had a 70mm from a Marquis on my setup prior. Worked great. $25 from Crazy rays.

I recommend you get a genuine Ford MAF from a junkyard if at all possible.

The link in that post for the adapter is no longer good but here is the adapter currently at Ebay.

https://www.ebay.com/itm/112931832578?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5335821607&customid=&toolid=10001&mkevt=1

JD1964 · May 17, 2026

I dont know why that link wont post the way i wanted it to. Anyway, i copied the text i wanted to share. Here it is

Simple and cheap MAF swap...

94-95 Mustang GT MAF - $40-$100. It is 70 MM instead of the stock 55 MM on regular stangs built prior to 94. It uses a slip on duct on the side that goes to the throttle body and a 4 bolt flange on the other. You need a flange adapter to fit the stock slip on air ducting that goes to the air box. Wiring plugs right in with no changes. *1 *2

Once your replacement 70MM MAF is in place, disconnect the battery for about 10 minutes. When you reconnect the battery and start the engine, the computer will relearn the settings for the new MAF.

*1.) Metal flange adapter http://www.kustomz.com/cat3.html Buy the TR70 for $44.95. Or spend some time on eBay looking for one that may fit.

*2.) MAF & sensor interchange
The 94-95 Mustang 5.0 MAF & sensor is also found on:
1995-94 Mustang 3.8L F2VF-12B579-A2A,
1994-92 Crown Victoria 4.6L F2VF-12B579-A2A,
1995-94 Mustang, Mustang Cobra 5.0L F2VF-12B579-A2A,
1994-92 Town Car 4.6L F2VF-12B579-A2A,
1994-92 Grand Marquis 4.6L F2VF-12B579-A2A,
Evidently the –A1A, -A2A, AA, etc. on the end of the part number is a minor variant that did not change the operating specs. You should be able to ignore it and have everything work good.

JD1964 · May 17, 2026

Btw, this 70mm MAF upgrade works very well with the stock air box. If you still have your stock air box, use it. If you still have your stock air box and for some reason dont want to use it, sell it to me.

JD1964 · May 17, 2026

Heres info on making the Explorer TB work with Foxbody linkage

http://www.veryuseful.com/mustang/tech/engine/ConvertingExplorer65mmTB.pdf

91firecracker · May 17, 2026

JD1964 said:
Btw, this 70mm MAF upgrade works very well with the stock air box. If you still have your stock air box, use it. If you still have your stock air box and for some reason dont want to use it, sell it to me.

I guess I fibbed when I said "bone stock". There was/is a CAI installed so no stock box.

Thanks for the info on the MAF upgrade. There are quite a few junkyard MAFs that you referenced around me.
I basically need to decide if I want to use the 19's from the Mountaineer and do this upgrade or go big with 30's and get a MAF (like the PMAS) to match.
Where/how much do I want to spend?! Always the question

JD1964 · May 17, 2026

If you’re hell bent on buying new injectors and calibrated MAF, might as well go 42’s. Easily managed by the EEC and will give you room to grow. I maxed my 30’s and went to 42’s so I paid twice.

AeroCoupe · May 17, 2026

With a calibrated MAF you really want to stop at 30’s. It seems that any larger and they just don’t work as well. This isn’t just me as several of us on here have experienced, seen, or read the same thing from multiple sources.

Noobz347 · May 21, 2026

I was one of those.

I tried to go from:

Stock engine with 2.1L KB, FMU and 19s (which worked totally fine BTW) to a calibrated MAF and 42s. It ran but it was pig rich just about everywhere and low speed manners totally sucked.

I made an appointment and trailered it 2 hours for a dyno tune. I did [not] want to pull the blower (again) to go back to the 19s.

JD1964 · May 22, 2026

In my case, 42’s with calibrated ProM MAF has been working fine while running NA. I monitor the wideband regularly and no rich conditions whatsoever.

AeroCoupe · May 22, 2026

Brand of injectors and MAF?

JD1964 · May 22, 2026

I have the Ford Lightning green top 42’s and a Pro M MAF

Noobz347 · May 22, 2026

JD1964 said:
I have the Ford Lightning green top 42’s and a Pro M MAF

This is the same combo I tried to go to without a tune.

91firecracker · May 26, 2026

JD1964 said:
I recommend you get a genuine Ford MAF from a junkyard if at all possible.

The link in that post for the adapter is no longer good but here is the adapter currently at Ebay.

https://www.ebay.com/itm/112931832578?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5335821607&customid=&toolid=10001&mkevt=1

Picked up a MAF from junkyard for $20 today. That ebay listing is sold out, is this similar? The dimensions seem different.
Ebay

JD1964 · May 28, 2026

I’m not sure about the dimensions off hand. The setup I had was moved to another car which since has been sold.

What car did you pull the MAF from in the junkyard? What are the part numbers on the MAF?

91firecracker · May 28, 2026

My son picked it up for me as he lives nearby the JY which is over an hour from me. I would measure it but don't have it in hand yet. It was off a '94 Towncar. Part number F2VF-12B579-AA

Engine Donor '00 Mountaineer meet '91 Fox

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