Vortec L31 cylinder head

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 *Engines that  have the thermostat removed. A missing thermostat is an indication the engine was running hot.
 *Engines that have evidence of stop leak in the radiator/cooling system. If it has stop leak, it was leaking. If it was leaking there's too big of a chance it overheated and cracked the heads.
-===Online or other "sight unseen" sources===
-'''Not recommended''' if from a private seller, especially true if shipping is involved. The cost for shipping a hundred pounds of cast iron across any distance is too high to warrant such a purchase. Very few people sells GOOD Vortec heads online. They're too easy to sell locally.
-Buying from a reputable volume/commercial seller might not be as big a risk, but research them fully and carefully before pulling the trigger. And remember, the shipping is on YOU unless otherwise stated in writing by the seller.
 ===Local private sellers===

Revision as of 00:27, 18 December 2014