Stroke to 408 or 418? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 4 (permalink) Old 02-02-2014, 09:58 AM Thread Starter
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Stroke to 408 or 418?

It seems like the 408 is a popular choice and it's certainly big enough for my application (75 Bronco). Is there a practical reason to go with a 408 over a 418? From CHP, cost is the same. As it's a 4x4, I'm not looking for lots of hp at high rpms. I don't see ever going higher than 5500rpm. Trans is a 4sp with a 4.11 rear & 33" tires. Thinking about Victor Jr heads, Performer RPM & a hydraulic roller. My nearly stock 302 dynoed 146hp at 4000 at the tires so anything will be a major improvement.
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post #2 of 4 (permalink) Old 02-02-2014, 10:48 AM
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Re: Stroke to 408 or 418?

The longer the stroke, the more the low end torque. The choice for your application seams obvious. I went with 4.17" stroke crank to get maximum punch out of the hole. The 4.10" stroke is a good in between. It's getting harder to find the 4.17" cranks anymore, but RPM still has them direct. Coast High Performance no longer sells them.
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post #3 of 4 (permalink) Old 02-02-2014, 11:14 AM
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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.

David

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post #4 of 4 (permalink) Old 02-02-2014, 01:17 PM Thread Starter
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Re: Stroke to 408 or 418?

Thanks guys. Was just wondering if 418 had "special" problems. I did a 383 Chevy some years ago so I'm aware of clearance issues.
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