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Engine case

Posted: Fri Feb 10, 2006 11:16 pm
by tanick
Anyone know what the difference is between a 4R and a 7R case is? Were there any different castings between them?

Posted: Fri Feb 10, 2006 11:25 pm
by veryporky
The 7R was the ultimate development of the magnesium case. Off the top of the head it carried more strengthening webs internally. After that they went to ali cases.