My 1985 HO motor has a non HO firing order?

I don't think Ford has ever changed the firing order on the 351. They changed late model 302s to the 352 firing order so that cylinders #7 and #8 would not fire consecutively.

 

The 352 has same 15426378 firing order as every other Ford OHV engine excluding 351, 400 & HO 5.0...

The 351/HO firing order of 13726548 places 5 & 6 adjacent to each other, stressing the front end of crank... Seen several HO 5.0 with broke crank between 5 & 6, never heard of such using the std firing order...

 

I was thinking along the same track. If this guy installed a Performer RPM cam with the old 302 firing order and with roller lifters then it is not right.

Here is the cam card for Performer RPM.

Camshaft: Performer RPM
Part #: #7122
Vehicle Type: FORD
Engine Application: 289-302 V8
RPM Range: 1500-6500
DURATION AS ADVERTISEDINTAKE: 290°EXHAUST: 300°DURATION @ .050INTAKE: 224°EXHAUST: 234°LIFT @ CAM (Lobe)INTAKE: 0.31"EXHAUST: 0.325"LIFT @ VALVEINTAKE: 0.496"EXHAUST: 0.52"LOBE SEPERATION: 112°INTAKE CENTERLINE: 107°IDLE VACUUM @ 1000 RPM: 11"The information below is for verification of
opening and closing events.INTAKE TIMING @ .050" LIFT:Opens: 5° BTDC
Closes: 39° ABDCEXHAUST TIMING @ .050" LIFT:Opens: 54° BBDC
Closes: 0° ATDCOPTIONAL VALVE SPRINGS: #5722CAM FEATURES: 367 HP & 340 ft.-lbs. with #7121 intake & #60259 heads. INSTALLATION NOTES: Use Edelbrock Performer-Plus Timing Chain and Steel Gear Set #7811/#7820 or Accu-Drive gear drive #7892. Do not use late model timing chain and gear sets that are designed for emission-controlled engines. These timing sets are machined in a retarded position and are not recommended for this camshaft installation. Edelbrock Timing Sets feature three keyways for specified timing selection.Footnote 1: Not for 1985-later engines with roller lifters. Screw-in studs, guideplates and adjustable rocker arms required.Footnote 2: Do not use dual valve springs .Use only recommended Edelbrock Sure Seat Valve Springs #5722.Footnote 3: Use stock ratio rocker arms only.

 

Now this is really a misleading bit of information. I'm using a late model (late 80's 5.0 HO) timing set (double row, roller chain set) in my 331 and it is not retarded at all. All you have to do to verify whether or not it would be is to take note of the timing marks in relation to the crank keyway and cam dowel. A straight-up set has the marks aligned with both the keyway and dowel pin.

 

That may be true, but the point of this is that the Performer RPM cam is not to be used with roller lifters. But for some reason Edelbrock found a reason to reccomend not using a late model timing chain with an early cam.

 

There may be some timing sets that have the retard built into them, but I have yet to see one. The only sure way to know if the cam is installed correctly is to use a degree wheel, otherwise you have no earthly idea as to if that timing set is installed correctly, who knows the cam you bought may be ground with the timing off and using that so called "emissions set" may set things right. Edelbrock puts that info out to sell their parts and to discourage you from buying some other brand of timing set.

 

That was a TYPO. I meant "351" (how embarrassing).

 

From the "reading" I've done, Ford retarded their timing sets from '72 forward. The H.O. set may not be retarded (I have no idea). I'm no expert when it comes to this.

 

After I posted I thought that may be the case...

Look on the bright side, now you ain't gonna have to worry about messing up a perfect year come Dec

 

You have a 1985 NON HO block..probably came out of an automatic mustang, a truck, whatever...If you ever have the intake off, look at the intake valley, it'll have flat tappet lifters, and the block won't be drilled for the spider, though the bosses will be there, and it can be drilled out and converted to a roller block.

 

There's no such thing as a non HO block, nor an HO block. They're all the same after 1985. The lifter valley bosses can be found drilled or not in those blocks used in vehicles other than the Mustang. I've found one that had "half formed" bosses that due to that flaw, was sent to the pickup truck line. I've also found them drilled and tapped in a pickup with a flat tappet cam. It's all purely pot luck.

 

You've said that 100 times, and we get it.

As I mentioned, he's got a NON HO option. In 85 you had two different block options, one that was drilled for the roller cam and got it, and one that didn't.

He's got the 175 NON ho flat tappet engine, not the 210 HP roller HO engine

 

But AFAIK the '85 non roller Mustang engine was still considered HO, just not as HO as the 5-speed roller cammed version... The '82-'84 were defiantly touted as being HO and had flat tappet cams...

Non HO used in other applications(Crown Vic, T-Bird etc)only had like 150HP

 

That's incorrect....the 85 HO engine was only available with a manual transmission.

The automatic mustang received a non ho engine with the standard firing order

http://auto.howstuffworks.com/1982-1983-1984-1985-1986-ford-mustang11.htm

 

But your continuing to refer to them as HO and non HO only tends to confuse those are not aware that there's no difference between the blocks. They would then pass on otherwise perfect blocks to build upon in search of that elusive "HO" block. There's no difference after 1985. And in the 1985 block, these were no better blocks in terms of strength than the weak sister 1980-84 blocks.