well the ls6 cam isnt perfect. infact its barely enough for 400 hp in a larger displacement engine...
but your plan is sound though.. the rear end gearing is the first thing in getting an ls engined car moving, second is converter, then cam and heads... a "cam only" 5.3 will easily do 450 hp and a 224 deg cam.. (and there are plenty "small" cams on ebay as people upgrade)
the mild ramps of the ls6 cam along with the mild lift, wide LS and the oem duration figures makes it a great emissions cam for a showroom car.. but with a relatively steep rear end gearing, and a light car, its far from ideal...
Honestly i wouldnt spend the money to go from a stock to ls6 cam...if you do you will for sure need springs so you would be looking at minimum $600 in parts for about 15whp.....204/219 .551/.548 117.5....is the specs on the ls6...if you went to like a 220/220 555.555 114...you would still have a very mild cam but would notice close to 50% more of an increase over the ls6 cam....it will sound a lot like stock, and drivability shouldnt really be an issue....just call a cam company and tell them your goals and they will set you up.....
my 3 cents...
ps.. im not knocking you.. its just that ive found it to be cheaper to do things right first time out
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