X O U or J heads on a 416?

Dusterndart340 said

I had X-Heads on my 418 with stock HP exhaust manifolds. Engine dyno peak power of 393 HP @ 4900 RPM and 472 Torque @ 3700 RPM. As stated above; it just couldn't pump any more air and ran out of breath around 5500 RPM. Heads had some bowl work and mildly ported.

Best of 12.96 with 3:55 and 2500 PMC converter on MT Drag Radials.

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What were the cam specs?

Was it dyno'd with stock HP exhaust manifolds on it?

I think HP and TQ per dollar, the stroker crank was money well spend. About $350-450 more than rebuilding your 340 with stock crank. Even with unported heads and HP exhaust manifolds.

You don't have to have the heads ported. Sure it will make more HP/TQ with ported heads. But so will your 340 with a warm cam.