Purple Shaft 280/280 cam

If you want a noticeably better idle and more low end torque than a 284/484 cam you need to totally quit thinking about the 280/480 cam. Did you here how it sounded on DVJ's 360? It'll be quite a bit more rough on your low comp. 318. It sounds like your telling yourself there's alot of difference between the cams when there is hardly no diff. at all. 3 degrees at .050" and .010" lift is nothing. Instead of idling at 1000 rpm with 4 inches of vacuum with the 284/484 it'll idle at 950 rpm with 4.5 inches of vacuum and have maybe 10 lbs. more torque max. Now you can believe this or not. That's your choice. But I'd bet the farm you'll have a pig down low with that cam in your 318. If you truly want more low end torque and better idling you need to consider a different cam.