Join Date: Jan 2008
Location: Seattle, WA area
Re: Stroke to 408 or 418?
The practical reasons most folks cite are directed towards drag racing and other high-rpm applications. Limitations of the 427 (and to a lesser degree the 418) are based on piston speed at high rpm. Do not confuse this with rod/stroke ratio, which is relatively insignificant in this comparison. With long stroke and high rod angularity, the mid-stroke piston speed becomes very high, and can be an issue at 7000+ rpm.
Because your rpm range is well below that, the other considerations are only directed towards those that will be building themselves. The longer strokes require a bit more 'fitting' for proper clearances at all points. This often scares newcomers that have not done it before, and tends to shift them to the 408 - which is almost a drop-in. If you are not assembling, then this is not a factor. If you are, be aware the required clearancing is really not a big deal. Seriously.
So, with your limited rpm range and other good-breathing parts, it would tend to indicate the larger displacements would be as-good or better for your application. My 2¢.
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