![SEARCH](http://www.mustangworks.com/images/search.png)
![The Mustang Works](http://www.mustangworks.com/images/mw_footer_logo.gif)
© Copyright 1995 thru 2008 - The Mustang Works™. All Rights Reserved.
MustangWorks.com is designed and hosted by Aero3 Media.
MustangWorks.com is designed and hosted by Aero3 Media.
![]() |
#1 |
Registered Member
Join Date: Nov 2002
Location: Woodstock, Georgia
Posts: 3
|
![]() What does H.O. mean? Are all 5.0's H.O.'s? If not, how do you know if you have an H.O. ?
Thanks Larry |
![]() |
![]() |
![]() |
#2 |
Registered Member
Join Date: Jun 2002
Location: Massachusetts
Posts: 157
|
![]() H.O. means "High Output." Not all 5.0's were H.O., but all the ones in the mustangs were.
__________________
1991 Mustang GT Conv: 58,000 original miles, 2nd owner. Engine: FMS 65mm tb/spacer, C&L 73mm maf, MAC cai. Drivetrain: Built AOD w/ Edge 2800rpm lockup converter, hardened 3-4 inner shaft, Trans-Go shift kit, B&M supercooler, FMS 3.73 gears & aluminum d/s, rebuilt traction lock. Exhaust: BBK unequal length shorty headers, BBK o/r h-pipe, Flowmaster 2 chamber mufflers. Chassis/suspension/brakes: Kenny Brown supersubs. The rest is stock. |
![]() |
![]() |
![]() |
#3 |
Registered Member
Join Date: Sep 2002
Location: Boston
Posts: 592
|
![]() It's been a while but I think the intake cover plate has 302 HO stamped on it.
__________________
91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior |
![]() |
![]() |
![]() |
#4 |
Mustangs
Join Date: Jul 2000
Posts: 1,938
|
![]() Like already mentioned, the 5.0L HO stands for 5 liter, high output. They're distinguished by factory headers from '86+, 5.0L HO intake cover plaque, and a few internal changes from the non high output engine.
__________________
2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem ![]() 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 ![]() 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock) |
![]() |
![]() |
![]() |
#5 |
Registered Member
Join Date: May 2002
Location: Tampa,FLORIDA
Posts: 340
|
![]() The H.O. has roller cam and lifters. The H.O. has a different firing order than the non h.o. The h.o. firing order is same as the 351W firing order. The firing orders are as follows:
H.O. 302 and 351W: 1-3-7-2-6-5-4-8 std. 302 1-5-4-2-6-3-7-8
__________________
5.0, Holley heads, 1.7 Scorp Rockers, Stealth intake, Holley 600 carb, Holley Mech. Fuel pump, MSD 6Digital, MSD distributor, Hotchkis upper/lower rear control arms, FMS B Springs, 3:73 (8.8) rear. Production # 9,377 |
![]() |
![]() |
![]() |
#6 |
Registered Member
Join Date: Nov 2002
Location: Woodstock, Georgia
Posts: 3
|
![]() Thanks guys for the information.
Larry |
![]() |
![]() |
![]() |
#7 |
Registered Member
Join Date: Jul 2002
Location: LA, or Bakersfield, CA
Posts: 273
|
![]() Are 5.0 HO engines good engines?
(I have an '87 5.0 H.O. engine in my '66 Mustang.)
__________________
Heidi 22/F/Cali. 1966 Mustang Coupe Ricer Hater's Club- member # 15 http://ricehatersclub.com/ http://MechaPS.com/ Last edited by rustang girl; 12-16-2002 at 02:21 PM.. |
![]() |
![]() |
![]() |
#8 | |
T.P.M. President
Join Date: May 2002
Location: Brownsville
Posts: 265
|
![]() Quote:
|
|
![]() |
![]() |
![]() |
#9 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
|
![]() The 5.0 HO first came out in the 1982 Mustangs. In 1985, they started using roller cams and "factory headers". In 1986 they stopped using carbs, and went to speed density SEFI. Also, from 1986 on, all 5.0's installed in passenger cars used the exact same block as the HO. While the HO's came with a roller cam, most of the others came with a flat cam, but could accept a roller cam. In 1988, the Mustangs sold in California switched from speed density to Mass Air. In 1989, all of the Mustangs had Mass Air. Also, the truck 5.0's all used the same block now too, meaning that even though they came with a flat cam, they would accept a roller cam. In 1993, they switched from forged pistons to hypereutectic (sp?) pistons.
All of the 5.0 HO's, as mentioned, used the 351W firing order. ![]() Take care, ~Chris
__________________
Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
RED & WHITE! |
![]() |
![]() |
![]() |
#10 | |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
|
![]() Quote:
![]() Take care, ~Chris
__________________
Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
RED & WHITE! |
|
![]() |
![]() |
![]() |
|
|