Tutorial: How to make engine part 45
EXHAUST VALVE SPRINGS
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Step 1:
open the intake valve springs
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Step 2:
edit the move-copy
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Step 3:
make the dimension 30mm
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Step 4:
change the shown dimension too
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Step 5:
save the "exhaust valve springs"
next: http://grabcad.com/questions/tutorial-how-to-make-engine-part-46