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Stock rocker arm question

Started by daves68, March 04, 2006, 10:15:46 AM

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daves68

March 04, 2006, 10:15:46 AM
I have 2 big blocks apart right now and, as I was cleaning the rocker arms, I noticed numbers stamped in them as follows:
1978 car 400 -    I  712 +

1975 motorhome 440-  I 512 +

Do they mean anything and if so what??
Thanks, Dave
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