They are very limited as far as volume; they'll make good low end torque but not much top-end power, and you can't spin them quickly enough to make good top end power without overheating the intake charge.
Their limitations are very apparent on larger displacement engines. Even if you install one on a 350 I wouldn't expect much more than 475hp out of the combo, but it will be fun stoplight to stoplight because it will produce ample amounts of low and midrange torque.
Troy
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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