The '706' and any other casting number is located on the front or rear of the head, on the top, NOT hidden and not under the valve cover.
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WHO_DCTC - Wifes 05 Z-71 Build - Now defunct as she decided she wants an Escalade too
Cream Puff - LS'd Square - Slow going on the back burner
Tripple Threat - 3 Wrecks for the price of one build thread
Project Delongdium - Step-Sons Plastic Clad 2003 Avalanche - DONE and Delivered.