looking for torque curve and horsepower range for a 1998 502 magnum mpi, just seeing if any one can help, i know they are 415 hp but looking for a range at different rpm, maybe some has a dyno sheet. please thanks

To my knowledge Mercruy never published such info.
I guess your chance is if someone have put a stock 502 on a dyno and saved the figures

Bruce,
I know there are different be still may be helpful to you http://www.fullthrottlemarine.com/ has dyno sheets of stock 496 on his project page.

Hi -

Here's an earlier thread:
http://www.offshoreonly.com/forums/a...p/t-68188.html

And this is helpful for parts, but I think your cam specs will tell the tale..the stock cam is 431-850478
http://www.marinepartsexpress.com/Me...M%20502%20V-8/
I found the attached pdf which gives you very good reason to run at WOT...but no torque curves, yet. I would suggest finding an equivalent aftermarket cam as they usually have published specs. I think Dennis Moore has a published equivalent in his book.......

thanks jim mer won't give any info on the motor.i put the hp 500 cam in it and a set of crane roller rockers may change the computer to raise the rpm to run at 5800 just can't seem to get the engine numbers i need may have to put it on the dyno to see where i stand bruce

thanks for all your help bruce