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I have a Briggs and Stratton 21 hp 331877 1449 g1 that i suspect the valves need adjustment. Does any one know what the gap should be? Also, is there a place to get a shop manual for this engine? The owners manual is worthless.

0.003-0.005 intake
0.005-0.007 exhaust

This may help you. https://docs.google.com/open?id=0B6NaqjIxWV1ybEN0LWo3azl6OUU

Rivets, thanks for the link. It is the best one I have seen and I think I have a no compression problem so off comes the head and go for there.