OneGearhead

ok. i think this may have been asked b4, but, i dont remember, so, if it has, i apologize. is there a difference between a 5.0 H.O. and just the regular 5.0. or, just 2 letters ??? any hp/torque difference, or not ?

NegadivOne

yeah im not sure of the power difference but i know the HO has a different firing order.

Obsol3te

Firing order, cam and the HO puts down better numbers

OneGearhead

thanks guys. wut is the firing order for our cars anyway Ob ??? i know it sad that i dont know it.

luckythirteen13

60hp difference

Obsol3te

hrmm lemme try and remember off the top of my head..


Starting from noon...I think it's


------------------------1
--------------------2-------8
------------------7----------3
-------------------6--------4
------------------------5
ugh it's somewhat close to that i think...
I know 1 is numero UNE at noon
and then its 8 clockwise
then to the leftish of one it goes 2? then 7
then i think something else
then 654
could be 1-2-7-3-6-5-4-8

buggah ill find it for ya memory is failing me tonight


Edit: BAH was close with second guess
1-3-7-2-6-5-4-8

Obsol3te

1987-95HO 5.0************************************Non-HO 5.0
(Mustang / Mark VII)*******************************(Cougar / Thunderbird / Crown Vic / Grand Marquis)
Higher-flowing E7TE heads***************************Standard "swirl port" heads
Higher-lift HO cam (performance/econony)**************Lower-lift cam (fuel economy, torque)
TRW forged pistons with reliefs***********************Aluminum flat-top pistons
60mm throttle body stock ***************************50mm throttle body stock
19 lb/hr fuel injectors ******************************14 lb/hr fuel injectors
Better breathing upper intake ************************Standard flow rate upper intake
Factory unequal-length headers **********************Factory exhaust manifolds
HO/351 W firing order ******************************Unique non-HO firing order
225 hp *******************************************150 hp (155hp in 1988 only, w/dual exhaust

_IZoCk_

are you sure about that? I hope so.

Stinger

yea he is correct.

roundman

the major difference, besides the firing order, between the standard 5.0 and the 5.0 HO is that the HO uses a roller cam and roller lifters while the standard uses a flat tappet lifter and standard flat tappet camshaft. this means the blocks are slightly different between the two also as the lifter gallery is different for the roller block. this is also why the HO can make more HP than the standard since the roller lifter has much less frictional losses and can follow a more radical cam lobe profile designed to open and close the valve more rapidly than a flat tappet lifter can.
the 5.0 HO uses the same firing order as the 5.8L (351ci) engine which is different than the standard 5.0 order