Hey guys,
I know this question comes up often on various forums (High Compression/Low Boost vs Low Compression/High Boost) but I'd like to limit the discussion to the Eaton M90 on the 3800SII.
If I am putting together an engine build, say a 350-400bhp setup, and I am limiting myself to using the M90... does the L36 make more sense than the L67? (I'm not really talking about a simple top swap, but rather, building an engine from the ground up.)
My understanding is, both blocks can handle this horsepower range as long as detonation is prevented. Since the L36 can make more power with the same amount of boost as the L67 (assuming no knock), I would assume that you can run closer to the stock pulley than you could with an l67.
So rather than running a tiny pulley, which creates more drag on the crank, and generates more heat... why not just run a bottom end with more compression, and a bigger pulley? Seems like a much more efficient setup.