how to tell H.O.from motor?

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venom97

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Apr 29, 2003

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Illinois

Nov 25, 2006

#1

• Nov 25, 2006

• #1

ive got a motor stamped with yyy,my motor out of my 95 and my 87 both had xxx.i know its a roller just not sure if its a h o or not?

 

Mustang5L5

That is…until I whipped out my Bissell

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Feb 18, 2001

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Nov 25, 2006

#2

• Nov 25, 2006

• #2

YYY was also used on some HO blocks

 

V

venom97

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Nov 25, 2006

#3

• Nov 25, 2006

• #3

Mustang5L5 said:

YYY was also used on some HO blocks

Click to expand...

so it is for sure or its possable,thanks for the info

 

O

OrLackThereof

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Nov 25, 2006

#4

• Nov 25, 2006

• #4

Uhhhhmmm..hard to tell...I know the older motors came with a different firing order from the HOs, which is in the camshaft. If theyre both rollers its be real hard to tell I think unless you knew the camshaft in it.

 

srothfuss

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Oct 17, 2004

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Nov 25, 2006

#5

• Nov 25, 2006

• #5

Yeah, wouldn't it be easiest to see what the firing order of the cam is befor trying to decipher the stampings?

 

O

OrLackThereof

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#6

• Nov 25, 2006

• #6

srothfuss said:

Yeah, wouldn't it be easiest to see what the firing order of the cam is befor trying to decipher the stampings?

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thats the thing I dont know if the HO rollers came with different stamps from the SO rollers.....cause only real difference is the firing order on the camshaft, other than that theyre both hyd. roller 302's. I mean hell they made HO rollers with both forged and cast pistons even, and I couldnt tell the difference. I know cast pistons tend to be lighter in color when cleaned up, where as OE forgings are dark...and mine have CA stamped in the part # on the face of them, indicating cast.

 

z2o_what

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Mar 31, 2005

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princeton, WV

Nov 26, 2006

#7

• Nov 26, 2006

• #7

the xxx's and yyy's dont mean anything important ... it was probally just a shift change at the factory, or something like that.

 

Maryland Stang

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Aug 21, 2002

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#8

• Nov 26, 2006

• #8

If it's a roller block and it has reverse rotation the only real way to tell is to measure the lift of the cam.

 

jrichker

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#9

• Nov 26, 2006

• #9

edit: Evidently this doesn't work to distinguish high lift cams from low lift cams commonly found in trucks. Therefore I am pulling the comments I made previously.

 

D

danistanggt

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Nov 26, 2006

#10

• Nov 26, 2006

• #10

there are some older stang engines that the firing order is the same as a sbc..1-8-4-3-6-5-7-2.

so what you guys are saying, is that the casting numbers on the block and the vin number don't mean ****??
i know an s code is a 390 motor. that does not necessarily mean that the motor that is in the car is correct.

i will go to the shop later and get the code book that we use.

man i remember back in the day when cars had their original motors....

 

Maryland Stang

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#11

• Nov 26, 2006

• #11

jrichker said:

If you feel pressure, it is a HO engine.

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I have the greatest repect for you jrichker but this is wrong. This test will only tell you if it has a reverse rotation cam or not. My '95 F-150 has a reverse rotation roller cam in it and this engine is not an HO. It has a low lift cam, truck intake and cast iron exhaust manifolds. Like I said, it's not an HO.

I know all I'd have to do is switch cams and throw a set of shorties on it (the truck intake is better than a Mustang intake) to make it a HO but that doesn't change the fact that it's not a HO.

It's my opinion that the HO engine is more a package than just an engine. 5.0 block with 9:1 compression, HO cam and intake, tubular exhaust manifolds and true duals with H pipe crossover. And since it uses a specific computer there may be a performance tune made just for the Mustang.

 

V

venom97

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Nov 26, 2006

#12

• Nov 26, 2006

• #12

so i could throw in a stock ho cam and dizzy on a non ho motor and it would be an ho?(theoretically)

 

S

shawn007

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Nov 26, 2006

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Nov 26, 2006

#13

• Nov 26, 2006

• #13

under the intake top plate will have a HO stamped on the intake

 

Maryland Stang

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#14

• Nov 26, 2006

• #14

venom97 said:

so i could throw in a stock ho cam and dizzy on a non ho motor and it would be an ho?(theoretically)

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That would be the majority of it, yes. But the jump from my 185 HP F-150 engine to my 225 HP Mustang engine needs a few more parts. The cam alone isn't going to make a 40 HP difference. BTW, for those who wonder, both blocks are grey in color and they both have E7TE heads on them.

 

L

Lxstang306

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#15

• Nov 27, 2006

• #15

easy way to find HO look at the firing order 1-3-7-2-6-5-4-8

for an HO NON Ho is 1-5-4-2-6-3-7-8

351 has the same as the HO 351 is wider and taller kinda look just like a 302

 

Maryland Stang

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#16

• Nov 27, 2006

• #16

Lxstang306 said:

easy way to find HO look at the firing order 1-3-7-2-6-5-4-8

Click to expand...

My non HO motor in my truck has this firing order. The only thing the firing order tells you is that it has a reverse rotation (351 firing order) cam in it.