The 8V92 Silver engines began with serial number F73594
The 6V92 Silver engines began with serial number F83425
Any serial number after those above would be a silver engine. Production of the silver began in 1982.
Hope this helps,
Joseph
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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