5.0 H.O. vs non H.O.

[fordrngr]

What is the difference? Is it just the firing order? Or are the crank and cam different too?

 

[xxxCadillacxxx]

the main difference is the cam. If you swap out the cam for a letter cam or otherwise high performance, it will change the firing order the standard. The if it is a low output it probably has the earlier crank with the heavier counterbalances. Although that isnt the prefred crank for high perf applications it will work fine with the correctly matched flywheel. i think the pistons and rods are dimensionally the same.

 

[Gearbanger 101]

Assuming that they're both roller bolcks....
camshaft, intake, pistons, possibly fuel injectors, heads (unless it's a truck block), and about a dozen other little odds and ends.

What's the engine out of and what year?

 

[fordrngr]

It's out of a station wagon. I'm not sure of the year but it only has 130,000 on it. I was planning on rebuilding it but I wasn't sure if I could use the H.O. parts of not.

 

[90mustangGT]

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.

 

[PhLoBuS]

when were the non HO's made?

 

[Gearbanger 101]

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.

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

 

[JB66]

My 89 Crown Vic had a roller cammed 302 in it originally (I'm 2nd owner). When it started knocking at 180,000 miles, I put in a rebuilt 5.0 HO long block. Original flywheel, balancer, all accessories bolted right on. I did add a mustang upper & lower intake w/throttle body. Reversed the upper intake to fit properly.