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Original Message
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| RE: Steel 391 truck crank |
| By Jeff H. - 04/09/2003 10:40:53 PM; IP 172.198.75.247 |
The cost of having the crank machined would be prohibitive. Turning a crankshaft on a lathe takes considerable set-up time unless the shop does this on a regular basis. Check with some of the bigger crank grinding shops they will probably have the best prices. Even then I suspect the cost will be up in the range of the price of a good 427 steel crank. If you really have to have a steel crank I would just find a 427 $ crank. Plus...these cranks (C5AE) are cross drilled for better oiling. In my opinion these are the only applications that require a forged steel crank:
High RPM endurance racing engines
High HP Blower engines
High HP Nitrous engines
Here is a quote regrading turning down a 391 truck crank from Pat Ganahl's book "Ford Performance":
"Given the reliability of the cast FE cranks, such a swap is probably of questionable practicality, considering the work and cost invloved."
Here is another quote from Pat's book regarding the reliability of the 3.78" stroke cast iron FE crankshafts:
"Ford says they are good to 6000-7000 rpm in drag race engines of up to 600 horsepower (unblown)."
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