5.0 H.O. vs non H.O.

90mustangGT said:

I thought the difference between HO and non HO engines bottom ends was that one is Hydrolic Roller and the othere is hydrolic flat tappet, and the firing order is different, 3 and 5 are swapped. Also, earlier 302's had 28oz counterbalances, while HO is 50oz.

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Actually, if you want to be technical about it, the 79-84 Mustangs used non-roller blocks, but were considered HO as well.

I'm taking a guess that he's refering to the most common HO engines used in the '85-95 Mustang, 85-86 Capri, 86-92 Lincoln Mark VII's, 91-93 Thunderbirds/Cougars.

HO really has less to do whether the camshaft is roller or not and more to do with it's firing order.

Non HO camshafts were the standard 1-5-4-2-6-3-7-8
...while the HO used a 351W firing order of 1-3-7-2-6-5-4-8