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4,291 Posts
The block NEEDS to be decked if ur putting on a new HG, if you don't deck the block it won't sit properly, and u'll get another blown HG. 147-160 is even a broad scale, and 125 is much too low. You most likely had coolant on ur plug from a BHG. Just to be sure, check for coolant in the exhaust gases. Although this sounds like a for sure bhg. Doesn't matter how reputable the shop is, if they don't know that things need to be decked and machined before fresh installation then all their credibility goes down the drain.