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They will push 8-10# in stock configuration on a 4.6 (289) Smaller blower pulley and 14-16# is common place. Unported 115-118 mph trap speeds are normal, Ported add 5 mph.

Should make a 5.7 run pretty hard, if you can get the piston to live. You need EFI to feed it though.

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was toying with the idea of using the lightning style with plenum opening on the top and modding it for a carb

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The Cobra Eaton is an M112 (112 CI displacement), the newer GT500's (and maybe Lightnings?)are M122's. The GT500 blower inlet is on the driver side. I have an 04 Cobra and have a ported Eaton sitting on the bench awaiting install, do you work for a well known company Ray? 525-550 RWHP depending on fuel and boost is basically maxing a 112, the 122 is probably worth another 40-50, and more torque low as the inlet is alot larger.

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I do them for extra money to pay for my hobbie. With the stock pulley, my porting picks up 30hp and 30 tq about which is the same as what other local guys have picked up using Stegmeier. I'm just much cheaper than him. I'm going to find out what the lightnings ones are