Engine 302 Vs. 302 H.o.

Justin422

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Nov 21, 2015
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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.
 
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mikestang63

SN Certified Technician
Aug 27, 2012
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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
 

90sickfox

I didn't really have an issue with the stink...
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Mar 2, 2015
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The tubular style factory 5.0 headers used to be pretty stainless steel before the heat and time rusted them....interesting.
 

Phillip123

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Jan 5, 2015
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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 :poo: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
 

stykthyn

I want to measure mine. It doesn't look that tall.
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Jul 6, 2006
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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.
 

Justin422

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Nov 21, 2015
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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

I want to measure mine. It doesn't look that tall.
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X303 will work on your roller block. It's not ideal though. If you run it I would suggest 3.73 gears.
 
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