5.0 vs 5.0HO Differences - Ford Mustang Forum
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post #1 of 20 (permalink) Old 10-06-2008 Thread Starter
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5.0 vs 5.0HO Differences

Im sure its been asked before but I can get a real answer. Just maybes and I think so and on. What are the exact differences between the 5.0 and the 5.0 HO?

I like to let 'em stick with me for first and second, then I put the hurt on 'em when I chirp third ~

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post #2 of 20 (permalink) Old 10-06-2008
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one of them is that the h.o. have an a roller camshaft, a diferent intake, also has a diferent material distributor gear, because the camshaft is made from steel.

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post #3 of 20 (permalink) Old 10-06-2008
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The 87'-92' H.O. has forged pistons and more compression because of it. Theyre all hydraulic roller cams while the non-H.O. is flat tappet. 93' and up H.O's arent forged pistons and have less compression, but the pistons are hypereutectic. The H.O has a 351w firing order and the 302 dosent. The H.O.'s also have stock shorty headers.

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post #4 of 20 (permalink) Old 10-06-2008 Thread Starter
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Quote:
Originally Posted by 86Lx View Post
The 87'-92' H.O. has forged pistons and more compression because of it. Theyre all hydraulic roller cams while the non-H.O. is flat tappet. 93' and up H.O's arent forged pistons and have less compression, but the pistons are hypereutectic. The H.O has a 351w firing order and the 302 dosent. The H.O.'s also have stock shorty headers.
So do the regular 302s have the classic 302 firing order from the 60s and the flat tappet cam thus allowing me to run a cam out of an older Windsor 289 or 302? Also, any idea on the compression?

I like to let 'em stick with me for first and second, then I put the hurt on 'em when I chirp third ~

1967 Plymouth GTX, work in progress.
440 cubes (thats 7.2 litres for you modern guys)
375 horses
480 ft lbs of torque
MODS: Direct Connection Purple Shaft cam
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post #5 of 20 (permalink) Old 10-06-2008
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Actually from what I've read. The 87-93 HO 5.0 fox mustangs have the same compression ratio, which is 9:0:1. In 1986, the HO had e6 heads, instead of E7TE(f-150) heads and it had higher compression at 9:2:1 with flat top pistons. From 1986 to 1988(expect for California) EFI 5.0 HO mustangs had the speed density system, instead of the Mass Air meter, which is better for aftermarket cams. The 93-95 5.0 mustang engine had cast hypereutectic pistons. They are not bad. It's just that forged is better for forced induction and nitrous, but they are heavier than the non-forged. The 93's have the same power as the other early 90's mustangs, it's just that Ford decided to revise the way they measured power. The 225 and 300 pounds of torque came from the speed densitys and they kept on with those measurements until 1992. Also, it has a 351 firing order and I've heard from an engine re-builder that the 5.0 HO Windsor has the same cam as the 351 Windsor. The E7TE heads came from the ford trucks, which are not bad for stock, especially compared to the really crappy E6 heads. Before 1986, they were carburated. Go to mustanggt.org. They have all of the mechanical changes from year to year starting from 1982, ending in 1993.
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post #6 of 20 (permalink) Old 10-06-2008
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5.0, 5.0HO
cast pistons, forged pistons until 93
e6 heads ,e7 heads
Lopo intake ,HO intake
14 lbs injectors ,19 lbs injectors
50 mm TB ,60 mm TB
different firing order ,I think they are all have a roller cam. since 86

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post #7 of 20 (permalink) Old 10-06-2008
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150 HP vs. 225 HP

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8.68 @82.5 in the 1/8
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post #8 of 20 (permalink) Old 10-06-2008
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H.O. = '82-'95

All H.O. 5.0L engines had:
351W firing order ('82-'84, and '85 CFI, had a cam from a '73 351W Torino)
double roller timing chain

'82-'84 H.O., and '85 CFI H.O., did not have:
different heads than non-.H.O. ('86 also)
roller block (late '85' CFI did)
roller cam
forged pistons (late '92+ also)
headers (late '85 CFI did)

'82 = 8.4:1, 157 HP
'83 = 8.3:1, 175 HP
'84 = 8.3:1, 175 HP (4V) or 165 HP (CFI)
'85 = 8.3:1, 210 HP (4V), 165 HP (early CFI), or 180 HP (late CFI)
'86 = 9.2:1, 200 HP
'87-'92 = 9.0:1, 225 HP
'93 = 9.0:1, 205 HP (GT/LX 5.0L) or 235 HP (Cobra)

Non-H.O. 5.0L engines got roller blocks and cams in the mid-to-late '80s.

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Last edited by EagleAutosports; 10-06-2008 at 10:08 PM.
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post #9 of 20 (permalink) Old 10-06-2008
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Ok..everyone keeps going back and forth lol whos right??
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Quote:
Originally Posted by FoxChassis View Post
H.O. = '82-'95

All H.O. 5.0L engines had:
351W firing order ('82-'84, and '85 CFI, had a cam from a '73 351W Torino)
double roller timing chain

'82-'84 H.O., and '85 CFI H.O., did not have:
different heads than non-.H.O. ('86 also)
roller block (late '85' CFI did)
roller cam
forged pistons (late '92+ also)
headers (late '85 CFI did)

'82 = 8.4:1, 157 HP
'83 = 8.3:1, 175 HP
'84 = 8.3:1, 175 HP (4V) or 165 HP (CFI)
'85 = 8.3:1, 210 HP (4V), 165 HP (early CFI), or 180 HP (late CFI)
'86 = 9.2:1, 200 HP
'87-'92 = 9.0:1, 225 HP
'93 = 9.0:1, 205 HP (GT/LX 5.0L) or 235 HP (Cobra)

Non-H.O. 5.0L engines got roller blocks and cams in the mid-to-late '80s.
fox is on the money, check out Mustang 5.0 gt Registry

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83 5.0L 5spd gt--R.I.P,casualty of rust
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foxchassis is the correct person to listen to for this thread, he is right.

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How about the crank, is it forged or cast?
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All factory 302 cranks were cast except for the BOSS 302. It was forged.
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how do you know if you have the H.O or the regular 5.0
on the cover of my intake it says 5.0 H.O does that mean i have the 351.

l8r

leo
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