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Originally Posted by mstngjoe
Vizard recently did testing on a Spintron and dyno comparing similar flat tappet to roller cams (both solid and hyd in both cases). He found that until you exceed 270* duration on your cam, the flat tappet outperforms. From 270* to 280* or so their about even and from 280* on up the roller edges the flat tappet.
If it were me, I'd do some nice home porting/gasket matching of the W heads and maybe have them milled depending upon your current c/r, piston style, piston to deck height, etc.
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That would have to depend on what 'similar' meant. If they had the same profile, this is undoubtedly true. However, it is common for hydraulic rollers, street hydraulic rollers, to match aggresive race solid flat tappet designs in profile.
That said, some mild work on your new heads, a good valve job and maybe some bowl work from a good head shop (one that wins races), and new springs and you should be good with your current cam or another low-cost flat-tappet hydraulic.
The cost of going roller will far exceed any improvements in future maintenance costs.