5.0 and 5.0 HO Engine Information - Page 2 - Ford Mustang Forum
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Quote:
Originally Posted by CNTLOSE View Post
Because Ford lied to put it simple. Ford dropped the ratings in 1993 so people would not be upset with a lesser HP rating when the new design came out. 1993 and 1992 where the same except Ford put the new hypertonic pistons inside the block in '93.
Hypereutectic.

1993 Mustang GT Convertible
3.73 gears, intake, shift kit, roll bar, subframe connectors,etc...
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Quote:
Originally Posted by CNTLOSE View Post
Because Ford lied to put it simple. Ford dropped the ratings in 1993 so people would not be upset with a lesser HP rating when the new design came out. 1993 and 1992 where the same except Ford put the new hypertonic pistons inside the block in '93.
Ford didn't "lie". Ford changed the way they tested and rated the engine. Other posters and myself have gone over this a bunch of times.

And yes, the fan attached to the engine is part of testing. All accessories are. Make sense that if there is an electric fan instead of a belt/crank-driven fan, there would be a HP gain.

Ford put hypereutectic pistons in late '92 model year blocks....see the first post in this thread.

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1986 302 help

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No, 1986 was the only year to have these pistons. I have heard people getting away with GT40 heads on 1986's, but it is not the norm. (I personally do not know anyone who has done this...I have just heard it's been done.) 1987 and up are notched and heads can be swapped right on.
I pulled a motor from an 86 GT. I have an Edelbrock Performer 2121 intake with a Edelbrock Thunder 650 carb uninstalled at the moment. Can I use GT40P heads from an Explorer? If so, what year Explorer do I look for to get them from? My Jeep and I thank you guys! actuallyajeeper...
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WOW I like that!
In 85 they did some good changes. Mine was a 85 with stock engine with bolt ons and I made 300 HP at the rear wheels on 100 shot of nitrous at 5500 RPM's.
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Quote:
Originally Posted by actuallyajeeper View Post
I pulled a motor from an 86 GT. I have an Edelbrock Performer 2121 intake with a Edelbrock Thunder 650 carb uninstalled at the moment. Can I use GT40P heads from an Explorer? If so, what year Explorer do I look for to get them from? My Jeep and I thank you guys! actuallyajeeper...

I believe you can put the GT40P because they have a 64cc combustion chamber as long as you do not have an extreme lift cam. But i would not use the GT40P heads just get the regular GT40 heads with casting number F3ZE becaus with the GT40P heads you will need to get special headers because of where the spark plugs are.

1991 Mustang LX Budget Build, 5.0 rebuilt Stock crank and rods, .030 Forged Keith Black pistons, Ponydown 70mm turbo kit @ 12psi, Custom Built Intake, Fully Ported E-7s, Trick Flow Valve springs, Trickflow Stage 2 cam, FRPP 42# injectors, Walbro 255, PMAS 3 1/2" Blow through MAF, A9T ECM, 3.73 gears, Tremec TKO transmission, Steed Tri-ax shifter, fidanza aluminum flywheel, spec3 6 puck clutch, McLeod sfi bellhousing, Lakewood LCA UCA, 2.3 Front springs.
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in 88 5.0ho calif cars are maf . i have one, big G

93 LX, 5.0, aod 3.73,bbk shortie headers, x pipe, pypes 2 1/2" all mandrell bent , carbon fiber driveshaft,70mm throttle body,73mm c&l meter, 24lb hr injectors,b303 cam, crane cobra 1.7 r rockers, electric fan, 6g alt,underdrive pullies,00 gt wheels 17x8 1/4 mile time 12.85. @ 108.96 mph .100% italian
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GT40's or GT40P's ???

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Originally Posted by 25thfox View Post
I believe you can put the GT40P because they have a 64cc combustion chamber as long as you do not have an extreme lift cam. But i would not use the GT40P heads just get the regular GT40 heads with casting number F3ZE becaus with the GT40P heads you will need to get special headers because of where the spark plugs are.
I've asked for help on numerous other forums and AFM is THE BEST!!! 1 day and I got answers! Finally!!! Now I know where to find the answers I need! OK enough praise... I have a friend who does custom exhaust. Could you send a link of the headers needed to run the GT40P heads? Please correct me if I'm wrong, I read the "P's" are a 25 HP bolt on. Will I get the same results with the F3ZE's? You guys(and gals?) are the best! actuallyajeeper...
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Quote:
Originally Posted by 50fanatic View Post
Hypereutectic.

Yeah thats it!

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Originally Posted by FoxChassis View Post
Ford didn't "lie". Ford changed the way they tested and rated the engine. Other posters and myself have gone over this a bunch of times.

And yes, the fan attached to the engine is part of testing. All accessories are. Make sense that if there is an electric fan instead of a belt/crank-driven fan, there would be a HP gain.

Ford put hypereutectic pistons in late '92 model year blocks....see the first post in this thread.

Okay so Ford did not "lie" they "changed" the way they did ratings. Ford has said it did this so not to upset people with the new body style having less hp than the old. The Taurus did not lose hp, the Escort did not lose hp, nope only the Mustang, hhmmmmmm....

1990 Mustang GT Convertible
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Last edited by ScottHalliday; 08-19-2012 at 09:35 AM.
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So Ford did this new rating system ONLY for the Mustang's '93 model year? After the Mustang's '93 model year it was back to the old rating system again for the Mustang's '94 model year?
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Quote:
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So Ford did this new rating system ONLY for the Mustang's '93 model year? After the Mustang's '93 model year it was back to the old rating system again for the Mustang's '94 model year?
No, I agree Ford stated it changed the way it rated horsepower, and this was a more "acurate" number. However, inside Ford sources stated it was a marketing ploy because the marketing types could not fathom a new car hitting the market with 10 less horsepower than the old favorite, so the number was artificially lowered for 1993.

Source: Mustang 5.0 4.6 1979-1998, page 47 wrote by Matt Stone

Quote:
Originally Posted by actuallyajeeper View Post
I've asked for help on numerous other forums and AFM is THE BEST!!! 1 day and I got answers! Finally!!! Now I know where to find the answers I need! OK enough praise... I have a friend who does custom exhaust. Could you send a link of the headers needed to run the GT40P heads? Please correct me if I'm wrong, I read the "P's" are a 25 HP bolt on. Will I get the same results with the F3ZE's? You guys(and gals?) are the best! actuallyajeeper...
They will increase HP and 25 would sound about right. You can buy brand new ones for $500 or get a good set of used ones for as low as $100...but you will want to have new springs and valves installed.

This is one link for headers that will fit. You can find several brands just look at different websites and read the description...it will tell you if they will work with the GT40P's.

79-93 HEADERS, SHORTY, STAINLESS STEEL MUSTANG

Good Luck!

Also here is another site discussing various headers and mods needed for P heads.

StangBangerz Forums

1990 Mustang GT Convertible
2004 CVPI

Last edited by ScottHalliday; 08-19-2012 at 09:36 AM.
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Quote:
Originally Posted by CNTLOSE View Post
No, I agree Ford stated it changed the way it rated horsepower, and this was a more "acurate" number. However, inside Ford sources stated it was a marketing ploy because the marketing types could not fathom a new car hitting the market with 10 less horsepower than the old favorite, so the number was artificially lowered for 1993.

Source: Mustang 5.0 4.6 1979-1998, page 47 wrote by Matt Stone
Malarkey. Artificially lowered. Right.

I just looked at that one page and there are errors all over it.

It is common frickin knowledge that HP dropped slightly in late '88 (not '91, as written in that book) with a cam profile change, and again in '89 with the addition of the MAF sensor ('88 in CA), but the rating didn't reflect either.

Can anybody tell me what the old (pre-'93) testing procedure was and what it became? Anybody? Bueller?

Getting your (mis)information from a book that seems to be fraught with errors doesn't afford you very much credibility to argue with anyone anyway...

Last edited by ScottHalliday; 08-19-2012 at 09:37 AM.
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Quote:
Originally Posted by noble steed View Post
Most HO motors produced between 87-93 were RATED at 275-300 torque. Remember, this is just a rating, it is not an accurate measurement of torque. 86- and earlier were rated at 245-260 I believe. For instance, the 2005-08 Mustang GT is rated at 300 horsepower. You put it on the dyno, it would probably only put out 270-75 horsepower. The 300 hp rating was a selling point. Some cars are over-rated while some are under-rated. It's a hit and miss on the actual numbers when a person buys a new car.

Yes they are accurate readings of horsepower and torque. They would be lower if you took your car to the dyno because you are taking the measurement from the rear wheels and not the fly wheel like they do from the factory.

Also the hp figures for the '93 are 205 hp and 275 tq.

Quote:
Originally Posted by 25thfox View Post
I believe you can put the GT40P because they have a 64cc combustion chamber as long as you do not have an extreme lift cam. But i would not use the GT40P heads just get the regular GT40 heads with casting number F3ZE becaus with the GT40P heads you will need to get special headers because of where the spark plugs are.
It's the GT40 iron that have 64cc combustion chambers. The GT40p's have 61cc combustion chambers. And you can use any of the common OTS cams with them as well. Headers are a small problem but Ford, MAC and BBK have all been used with great success.

1990 GT w/stock bottom end and TFS TW's w/1.7 rr, stage 1 cam, TMoss ported GT40 lower and GT40 tubular upper, Flowtech mufflers w/dumps, Accufab 70mm TB and EGR, AEM cai, BBK 155lph fuel pump/fpr, ProM 75mm MAF, FRPP 24lb inj., BBK long tubes and o/r H pipe, Hurst shifter, FRPP 3:73's, LMR 5 lug conv., '97 GT wheels.

Last edited by ScottHalliday; 08-19-2012 at 09:32 AM.
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I love my mustang, how do i take care of it?

HEY!!! SO BEFORE I BEGIN I WANT TO WARN EVERYONE THAT I REALLY HAVE NO IDEA ABOUT CARS LET ALONE MY OWN PONY....SO PLEASE DON'T HATE ME IF I DON'T KNOW SOMETHING, I READ THESE FORUMS ALL THE TIME WHEN I HAVE QUESTIONS ABOUT MY CAR, AND TONIGHT....AT WORK I HAVE THE COURAGE TO JOIN, YA I JUST JOINED ALSO, BUT THAT AINT WHATS IMPORTANT, ANYWAY....

SO IM 19 AND STILL HAVE MY FIRST CAR WHICH, IS AN 88' MUSTANG 5 SPEED HATCHBACK. AND I LOVE THIS CAR, IT'S GOT SOME DINGS AND NEEDS A TON OF WORK, BUT I ABSOLUTLY LOVE THIS CAR, IM IN THIS CAR MORE THAN MY OWN ROOM, I SIT AT THE BEACH WITH IT ALL NIGHT, AND RUN TO GIVE IT HUGS AFTER WORK ALL THE TIME (IM SERIOUS) BUT AS I MENTIONED IT IS NOT IN PERFECT SHAPE AND I DON'T KNOW MUCH ABOUT IT SO IM NOT SURE I TAKE PROPER CARE OF IT. ITS SAT IN MY DRIVE WAY FROM WHEN I WAS 15 TO 18 THEN I FINALLY GOT TO DRIVE IT, THEN THE EXHAUST GOT RIPPED OFF (SEATTLE HAS HORRIBLE STREETS, AND TONS OF HILLS, AND APPARENTLY FIXING A POTHOLE ON THE HIGHWAY IS LEAVIN BIG SHEETS OF LOOSE METAL ON THE GROUND THAT BOUNCE UP AND HURT PONYS) SO THEN IT SAT FOR ANOTHER 6 MONTHS, THEN I JUST GOT THE NEW EXHAUSTS ON AND NOW I THINK SOMETHINGS WRONG WITH THE TRANSMISSION, AT LEAST THE REVERSE GEAR

PROBLEM: whenever i put it in reverse and try to switch from releasing the clutch peddle to the drive peddle the clutch pops out and goes to nutral, all other gears work fine, though a soft clicking can be heard at times and the only way i can back up is by balancing the fine point between switching from the clutch peddle to gas peddle do i need an entire new transmission or just a part or what?

also, as much maintence ideas and what not is appreciated, i mean really go all out in telling me, like routine maintence, upgrades, what things to check how often, where to get parts, who to trust with repairs, as much info you can about my baby, she deserves good care and i really want to give it to her (i call her Ruby) and if at my age trying to retain this car is worth it, or if i should invest in another car, seeing how im 19 and pretty broke
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Routine Maintenance:

1. Change your oil EVERY 3000 miles.
2. Rotate your tires every 5000 miles.
3. Change spark plugs every 15000 miles, then replace distributor cap, rotor, and wires every 20000 miles.
4. Replace air filter every 10000 miles, fuel filter every 15000.
5. Always check your oil at least twice a week to make sure it's full.
6. Check your radiator to make sure it's full once a week. Completely flush and put new coolant in the radiator once a year. Make sure you dilute the coolant 50/50 with water. Don't buy the pre-mixed coolant, it's a rip off.
7. Inspect your brakes every time you change your oil.
8. Replace wiper blades whenever they start to streak or crack.
9. Always check your fuses under the dash every once in a while just to be sure nothing is blown.
10. Keep your windshield washer fluid and brake fluid full.
11. Keep your U-Joints on the drive shaft lubed every 10000 miles.
12. Check your transmission fluid every 10000 miles and top off if low, drain and refill with new gear lube every year.

( Carter ) 1993 Mustang GT - "Blackie" - The go-getter.
1991 LX 2.3 5 Speed Hatch - Family Mustang
1969 F-100 390 4 speed - Project Rustoleum

Summit Racing and Latemodel Restoration Supply have brought me this far, my imagination will bring me all the way.
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SO IM 19 AND STILL HAVE MY FIRST CAR WHICH, IS AN 88' MUSTANG 5 SPEED HATCHBACK.

Is it a V-8 or 4 Cylinder?

( Carter ) 1993 Mustang GT - "Blackie" - The go-getter.
1991 LX 2.3 5 Speed Hatch - Family Mustang
1969 F-100 390 4 speed - Project Rustoleum

Summit Racing and Latemodel Restoration Supply have brought me this far, my imagination will bring me all the way.
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