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GM does have VVT system for its pushrod engines.
The 3.5 and 3.9 V6 OHV engines have VVT
The 6.2 V8 OHV engine also has VVT.
They use a cam phaser, a bit less complex then the Vipers, but gives the same effect. Its similar to what they use for OHC engines.
GM had a XV8 concept engine that used 2 cams in the block. GM also will bring out a 3 valve per cyl OHV engine, first for a cam in block or pushrod engine.
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2/20/2013: They Day the ****s Stopped
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