Solid Roller vs Flat Tappet - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 18 (permalink) Old 07-08-2013, 10:49 PM
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Re: Solid Roller vs Flat Tappet

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Originally Posted by Hottarod View Post
As far as the extra cost goes, it all depends on where you are. How much can you justify spending per horsepower at this point?

I believe that the rollers, given the same basic grind spec's will not necessarily make any more power. What my understanding that they do is give you power over a bit wider rpm range. That is definitely valuable. The other thing the roller will do is get you back power that would be lost from drag and friction of the flat tappet cams. On the other hand, the roller lifters are a little heavier so that is a negative factor on the roller side.

I don't remember ever seeing identical flat tappet and roller grinds compared on the same engine on a dyno. It would be interesting to see that done.
The more aggressive cam lobes and higher spring pressure/valve train stability easily trumps the flat tappet cams lighter lifter advantage. Not only that, since the roller cams have much more aggressive ramp profiles, you can run a cam with larger duration @.05 and still have less advertised duration. Larger cam without the drawback.

1968 Galaxie 500 Convertible
---533 Stroker---Trick Flow Street Heads, 260/[email protected] .655/.656 Solid Roller, Victor Intake, 1150 Dominator, 2800 stall, 2" Crites Headers, 3" Exhaust w/Magnaflows
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post #17 of 18 (permalink) Old 07-11-2013, 04:03 PM
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Re: Solid Roller vs Flat Tappet

Would that allow a more radical cam to behave better on the idle? That is something I need for my baby motor.
I guess it will have to wait until the next tear down if I decide to do something like this. I just had
my heads re-done and new springs installed a few months back.

1965 289 mustang fastback
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post #18 of 18 (permalink) Old 07-18-2013, 05:51 AM
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Re: Solid Roller vs Flat Tappet

Just changed out a 270hr Comp to a 260hr....All round better power band for what I needed and although the 270hr was a bit big do to gearing etc...it was a fantastic unit..I would even say a good idle....not smooth ..but not rough




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