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Original Message
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| RE: 391 Truck Engines |
| By Mel Clark - 09/16/2001 12:53:19 PM; IP 64.12.104.164 |
The 391 truck engines were designed for extreme heavy duty operation. There are several ways to identify them, the easiest, to me, is to look at the crank snout, it will be much larger than a passenger car crank and they were sought after by racers that ran big GMC blowers as well as by drag boat racers that drive the prop shaft off the crank snout. These are also the forgings that Ford and Holman-Moody used in the 427 race cars. The 391 also had valve rotators on the valves and the heads had 2 small exhaust heat cross over ports in the heads and intake. They also had deep dished pistons for low compression and the engines were balanced for low rpm operation.
If you have one of these engines you could sell the crank, if it checks good, for almost as much as the cost of a good new aftermarket crank. |
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