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It's not $4,200 for labor. If you paid only $800 for a cam kit, you got a VERY good deal. My PAC springs, Ti retainers, and cam came to a LOT more than $800.00 Not trying to start a pissing match, but stock reliability is worth LOT. I dont agree that cam kit installs are near 75% of the cost of a blower install. There are NO cars out there with a good cam kit that will go 250,000 miles like a stock LS1 will, without tearing into the motor. A blower kit is totally stock reliability, unless your drag racing everywhere you drive. In that case, it would still be more reliable than a cam kitted engine. You won't need to change valve springs every 30,000 miles, or worry much about cam lobes and lifters being eaten, or cam bearing wear, either. You'll pay considerably more up front with a blower, but it will even out over time. Like you said, it depends how you use the car.
Texas Speed has cam kits for $800 for sale every day for full retail.
That's cam, pushrods, dual valve springs, new seals, an LS2 timing chain, new crank bolt and gaskets for $772.98. Retail. $900 if you want an oil pump (which, I mean, you should).
I'll have to change a LOT of valve springs to make up the extra $4k the blower is going to cost me.