Comments by "mpetersen6" (@mpetersen6) on "ENGINE BLOCK DECKS: Open vs Closed vs Semi Open" video.

  1. Ah, 2.7 Sludge-o-Matic. The sludge problem is actually caused by the small draon holes the head gasket
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  2. A lot also has to do with the machining processes being used by the manufacture. If an engine block is going to be broached as its initial operation its has to be cast iron* and is most likely better to be a closed deck design. Aluminum blocks are better suited to milling operations. * At least I've never heard of an aluminum block being broached. This puts an incredible amount of load on the block due to the clamping forces required and the tool pressure. The machining is being done with what basically amount to a huge file that is cutting the full width of the head face with the finish cutting tools. On the bottom end the top half of the bearing diameter is getting cut across it's full radius.
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