Up to .500
If you still have a stock short block, my advise would be to whatch out for anything with over .500 lift. Don't take my word for it, but what i do know with 1.94 intake vlaves and .500 plus cam the valves can hit the pistons causing a world of hurt. I'm not sure how much more lift you can get away with stock heads with stock valves but is couldn't be much.
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