408 Stroker

Bewy said

YR,
There have been PLENTY of tests where DP intakes have made more power than SP intakes throughout the rpm range for street drivers. [ Talking under 6500 rpm ] Richard Holdener did a test recently. From D. Vizard: almost 570 hp from a DP airgap on a SBC sounds pretty good to me for a 90% street driver.....

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You have experience with 4" motors? Not being smart at all, just curious.

I would use a DP on a 408 only if it was a low compression, non performance engine going in a heavy car or truck. I've stated this here many times, if you build a performance 4" small block and it's soft on the bottom end with a single plane intake you have made some mistakes choosing parts for the build.

If I were building it I'd probably go with a flat solid in the high 240° or low 250° @ .050" and .580" to .600" lift with around 10.5-1 compression, a Weiand X-Cellerator intake, then have a converter built for it. If you are seriously considering FI talk to whoever your buying from and see what type intake they recommend.

IMO, even with 3.55 gears it would be plenty strong on the bottom. I tend to build more on the race side so take my advice for what it cost.

Also call Dwayne Porter at Porter Racing heads and pick his brain.