Engine 302 Vs. 302 H.o.

Justin422 · Nov 26, 2015

Besides the firing order being different, what other differences are there between the 302 and the 302 H.O. engines? Hope this is the right spot for this question.

mikestang63 · Nov 26, 2015

The Block, crank and rods are the same, the differences are

HO 5.0 came with 225 HP non HO 5.0 had 150 HP
HO have E7 heads, non HO use the E6 heads.
HO have forged psistons with valve reliefs, non HO are cast and flat top
HO has a hotter cam than the non HO. Some non HO are flat tappet cams.
All HOs have a roller timing chain while pre 1988 non HO do not
HO motors have 19# injectors, non HO use14#
The HO upper Intake and throttle body opening 58MM vs non HO 50MM
HO have ss headers, NON HO 5.0 has cast iron exaust manifolds

stykthyn · Nov 27, 2015

I've never seen stainless headers on a stock engine.

90sickfox · Nov 27, 2015

The tubular style factory 5.0 headers used to be pretty stainless steel before the heat and time rusted them....interesting.

Phillip123 · Nov 27, 2015

the 87-93 ho motors have forged pistons,im pretty sure the 86 ho has forged pistons but theres no fly cut so u cant fun a good size cam.the regular 302 say in a crown vic has cast pistons and usally the e6 lower compression heads.the cam in a ho has the better firing order 13726548 where the reg 302 has the ty firing order. the blocks are the same. the crank is the same and the rods are the same.
ps 87-93 ho motors are a dime a dozen

Justin422 · Nov 27, 2015

So I can use a cam for a 302 in an HO?

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stykthyn · Nov 27, 2015

The cam question is tricky. It depends on firing order, lifter style, valve clearance,....can't say that any 302 cam would work.
As to HO motors being cheap and a dime a dozen? Deals are out there if you look, but the prices are well up over what they were a few years ago and the days of pulling a running explorer engine from the jy are practically behind us as well.

A solid functioning engine/tranny will fetch over a grand these days. That's over a third of what most of these cars are worth.

mikestang63 · Nov 27, 2015

stykthyn said:
I've never seen stainless headers on a stock engine.

You didnt look hard enough,

Justin422 · Nov 27, 2015

I got the motor (block, pistons, heads, shorty headers, cover) for $100 from a friend. I got a coworker who has a x303 roller cam new in box and crankshaft for $100 as well. I paid $800 for the mustang roller itself.

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stykthyn · Nov 27, 2015

X303 will work on your roller block. It's not ideal though. If you run it I would suggest 3.73 gears.

Scottybronco · Jan 16, 2019

Will the e7 heads fit on a non ho bottomed without the valve reliefs

General karthief · Jan 16, 2019

Heads will fit no problem, when you install higher lift cams is when you have ptv problems,

giddyup306 · Feb 19, 2019

Justin422 said:
So I can use a cam for a 302 in an HO?

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Yes. You need to change the firing order tho (as mentioned).

Engine 302 Vs. 302 H.o.

Justin422

Member

mikestang63

stykthyn

I want to measure mine. It doesn't look that tall.

90sickfox

Wasn't a pretty sight...and I've got big hands

Phillip123

Active Member

Justin422

Member

stykthyn

I want to measure mine. It doesn't look that tall.

mikestang63

Justin422

Member

stykthyn

I want to measure mine. It doesn't look that tall.

Scottybronco

Member

General karthief

wonder how much it would cost to ship you a pair

giddyup306

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Engine 302 Vs. 302 H.o.

Member

I want to measure mine. It doesn't look that tall.

Wasn't a pretty sight...and I've got big hands

Active Member

Member

I want to measure mine. It doesn't look that tall.

Member

I want to measure mine. It doesn't look that tall.

Member

wonder how much it would cost to ship you a pair

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