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Big cubic inch FEs with a lot of stroke are not go survive for long running above 6K RPM frequently, especially if it's with a heavy scat rotating assembly. It's above 6 grand where a mechanical roller shines, exactly where a stroked FE shouldn't go. Fo a race car, one that takes life 1/4 mile at a time, that might not be a bad thing. For a street driven Cobra, not a good thing.


Oh, ..YES, you can get that lumpy idle with a hydraulic roller. Sometimes it's even lumpier than a similar spec'd flat tappet due to the roller's faster ramp speeds.

Kev, I don't think your targeted solid roller cam's duration is 320 @ 0.050. The 320's probably the "advertised" duration spec. Streetability is entirely gone by 280 @ 0.050".