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I have never heard of a 427 with a mag. When I asked if anyone ran this setup pretty much everyone agreed that there is no way a maggie can flow the kind of air a 427 would need.
That's what I was told when inquiring about it for my 422 as well...
Now the real news:
There are not any plans for a 122 supercharger for ANY of the Corvette applications. The 112 is MORE than enough for any stock LS1 motor to handle, and more than acceptable for any larger cubic inch LS1 if calibrated properly. Don’t be fooled by the rumor mill, I know for a fact that there are NO PLANS for a 122 supercharger for the C5/C6 application. I have seen a LPE 427 with a Magnuson 112 make in access of 600 rwhp....I think that is more than most could handle on the street!
I'm glad someone raised the bs flag on this one. The maggie couldn't make 600rwhp on a 427 even if the 427 made 650rwhp N/A! You know what, maybe I'm wrong...yeah, if you added a 100shot it probably could. Look at the cfm rating of the blower...the math doesn't lie. Where do some of you guys get this ****? How many guys read this kind of crap, buy the wrong blower for what they want only to be disappointed later. The magnuson s/c is what it is and no more...420-500rwhp(and thats with all the bells and whistles). Yeah 21st century has put out a few that put out a little more than 500rwhp, but by the time you do that you could have purchased a turbo system that is capable of more than 600rwhp.