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Original Message
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| Heads, crank |
| By Royce Peterson - 01/08/2003 11:09:05 AM; IP 152.163.188.69 |
The crank on a counter rotating engine has rear oil seal grooves cut opposite from a normal crank. Just have your machinist remove the grooves when he turns the crank.
Most 427's had cast cranks originally that are the same as a similar year 390 crank. Only the 1965 - 1967 Medium Riser 427's received forged cranks. The cast cranks will take a tremendous amount of abuse. Ford has always made great cast iron cranks. I would not worry about it for a street car unless you are planning on high RPM clutch drops with nitrous or supercharged assisted horsepower and a pair of slicks.
If you must have a forged crank have it checked carefully by a machinist to see if it indexes properly. These cranks have typically been through hell and got abused regularly in racing. Many companies (Crower, for example) make new billet steel cranks for serious high horsepower applications. Most of us do fine with cast cranks and don't need to spend $2000 on a billet crank.
Medium Riser heads are C5AE-F casting number. Marine heads are C6JE or C7JE to name a couple of possibilities. Look at yours and post the casting number. Marine heads are Low Riser type and can be a good choice for most street driven cars. Just install 2.09 / 1.66 valves and they will be good for most anything.
Have your machinist quote you a bid on repairing them and compare to the price of new Edelbrock aluminum FE heads. Usually it is cheaper to get the Edelbrocks which are an improved version of the factory Medium Riser design.
Royce |
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