Most estimates range about the 500 fwhp, but it comes down to application, and it is actually the torque you are worried about. 500hp @5000rpm will hurt more than 500hp @7500rpm. Some will be said to take more, some will break with less.
If you're not driving a manual you're really just steering.
i know of a toploader with sequential shifter, 1tonne pressure plate, and with standard (but stepped) flywheel, that is pruducing almost 600rwhp (about 700fly wheel hp) and around 1600nm of torque. he has it for sale for about $1800 i think, to suit an EA
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