5.0 vs 5.0 H.O.

Apr 04, 2004 3 Replies
G

Anyone know what the difference is between these two motors? I'm asking since I have a Merc Grand Marquis 5.0 to put in my 1966 Mustang. I bought the Merc thinking the 5.0 was a high performance engine, but it isn't "High Output." Runs well though. I do know the firing order is different.



Gary in NC


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K

Gary, there are several items that are different.

To find out EXACTLY what the differences are, I'll refer you to a GREAT bunch of knowledgable folks for CV/GMs. Many of them have upgraded there Stock 5.0s to 5.0HOs.

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Tell them P71_Interceptor (ERIC) sent you there. ;>)

-ERIC

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W

typical hot rodding stuff, heads,roller cam,intake,headers,forged pistons & thinner piston rings.

notes:

1.auto trans equipped 85 mustang engines are not really HO engines. 2.86 HO mustang engines have oddball heads,true flat top pistons & smaller efi intakes.
  1. 83-84 HO mustang engines are not roller cam,they have cast pistons,manifolds
  2. 4 barrel appeared in 83, headers in 85(5 speed)
  3. 87-93 HO's are basically the same except for use of mass air in 89.
  4. 93-94-95 use cast hypereutectic pistons.
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2

You could also look for the Lincoln Mark VII motors. They were identical with the exception of a couple of brackets.

Don Manning

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