Comp Cams FW XE 274HR-12 vs. FS XE274H-10 Which One?????

[Cobra912]

Ok guys I'm scratching my head on this one.....I would like to know which one will work for me. I'm only looking for advice as to which one will work in a roller 331. I won't be buying a custom as this is not an option. One says 69-95 351 and the other says 63-95 289-302????? I want something with a little lope but nothing too radical. The remainder of the parts I have now are in my sig. Help???


Part Number 35-518-8
Engine 1969-1995 Ford
351ci,
Windsor,
8cyl.
Grind Number FW XE274HR-12
Description

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Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.555 0.565
Duration At 0.006 Tappet Lift 274 282

--------------------------------------------------------------------------------

Valve Timing At 0.006
Open Close
Intake 29 65
Exhaust 77 25

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These Specs Are For The Cam Installed At 108 Intake CL
Intake Exhaust
Duration At 0.05 224 232
Lobe Lift 0.348 0.354
Lobe Separation 112

--------------------------------------------------------------------------------

AND:
_________________________________________________________________

Part Number 31-246-3 Engine 1963-1995 Ford
289ci-302ci
8cyl.
Grind Number FS XE274H-10
Description

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Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.52 0.523
Duration At 0.006 Tappet Lift 274 286

--------------------------------------------------------------------------------

Valve Timing At 0.006
Open Close
Intake 31 63
Exhaust 77 29

--------------------------------------------------------------------------------

These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 230 236
Lobe Lift 0.325 0.327
Lobe Separation 110

--------------------------------------------------------------------------------

 

[86bluecobra]

I believe one is Hydraulic roller and the other is just Hydraulic. 274HR and 274H.

 

[Cobra912]

really??? Because I've seen the FS XE274H-10 with what I believed to be roller lifters, dogbones with hold down for sale with it. I'm confused........

Does this mean you think it is hydraulic flat tappet then??

 

[dcurtis]

really??? Because I've seen the FS XE274H-10 with what I believed to be roller lifters, dogbones with hold down for sale with it. I'm confused........

Does this mean you think it is hydraulic flat tappet then??

Ones roller ones flat, 274 (HR) Hydraulic Roller 274 (H) Hydraulic

 

[Cobra912]

AAAAHHHHH.....that makes sense. Thanks.


How does this cam compare to the Z303 and is it too big for my combo???

 

[5.0fox]

Also dont forget that the firing orders for those two cams are different. The first is for the 351w/5.0 ho firing order and the second is for the 289-302!

 

[Cobra912]

Good info. Is there a big difference if firing order is different. How does that work?

Anyone recommend the z303 cam or is that too big? I know someone who has one, but I just don't want something that I will lose power with or have to go crazy notching pistons.