Don P Posted August 1, 2017 Share Posted August 1, 2017 I bought a used GMC Envoy recently. Was reading up on some net info on these vehicles and came across a reference to this pdf file from GM. Seems to have been written for non-gearheads to understand. Probably was for the Corporate Execs or something. Seems too detailed for a media release, etc. Quite impressive considering that GM only thinks of it as a truck engine. Here's brief rundown on it. An inline 6 with an aluminum head, block, and oil pan. 4 valve head with twin cams c/w variable valve timing. 10:1 compression ratio Hyper-eutectic pistons with full floating pins, forged steel rods, nodular iron crank Vane-style crank-driven oil pump. Gerotor style water pump. Drive by wire throttle. PCM controls everything. (like sports cars and fighter jets) I've read this twice already, and I'm really glad I own one now. lol File included, if you want to read the long version.... vortec4200.pdf Link to comment Share on other sites More sharing options...
MRS Joe Posted August 1, 2017 Share Posted August 1, 2017 They take to mild boosting well on stock internals. Ours in our fleet trucks have been some the most reliable besides a few oil leaks. Link to comment Share on other sites More sharing options...
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