07-12-2015, 12:27 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
Well first we know it's not a sideoiler. Yes, the ribs would indicate a "service block".
Some numbers around the oil filer area will help nail down what it is. Look for something like C_AE _.
A few pics of the underside of the block might help as well.
Also, since it is stripped, take a flashlight and look into the freeze plug holes for a possible casting that says "428" on the outside of the cylinder casting.
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