Ls1....

i agree, ls1 all the way

kat trust me

I say SR20 for best cost to benefit

I would look at cost, installment how to, and aftermarket support. all of these motors stated can be pushed to 400-500 hp. so by the criteria I would look at the SR20 is the best optoin in my mind. and they are easy to install cause I am doing one at the present time.