Cam & head upgrade 360 mag
Assuming we are talking stock stall, larger number keeps lobes apart from each other so they arent opening intake and exhaust at same time which reduces static compression and lowers vacuum signal.
Basic cam article explains it very well
http://www.enginebasics.com/Engine Basics Root Folder/Basic Camshaft Understanding.html
Another article
http://www.hotrod.com/how-to/engine/ctrp-0805-camshaft-timing/
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