Just looking for Mercuiser 496 and or Volvo Penta 496 or both - STOCK real engine dyno numbers. I would like to have the MAG and the HO MAG if all possible. Also has anyone ever test hp at the propshaft for these other than the OEM. Thanks.

And if you have anything after the fact for numbers that the 496 was modified however and with whatever.

Some good info here John: http://www.offshoreonly.com/forums/g...h-busting.html

Ditto, might also contact Tyler Crockett. He posted 496 dyno numbers years back.

I am pretty sure Bob had a decent corretion factor. His tests were always spot on and he has answered questions for me several times (and was right). I know Tyler is a renowned engine builder but I am curious as to his correction factor on his 496 builds that I have seen. They are usually good. But, better than several others including Raylar themselves which creates some questions.... The same build with the same cam, and the same heads generating 40 more HP has to make a guy say hmmm.

We did dyno a stock 496 mag made around 385

I've got a 2003 496 MAG sitting at Retter Engine Development that should be dyno'd in the next week or two. It is now .030 over with forged pistons and h-beam rods but otherwise is totally stock. I can ask Ryan (Precision) for a photo of the dyno numbers to post.

I looked at a 496 - 35' fountain that had forged pistons, custom cam, head work, pushrods, etc. Arizona Speed intake and 85mm throttle body. It was $12k (2 engines) worth of work NOT including the Arizona intakes and TBs.

They put down 578HP and 607 TQ. 150 hrs later (when I drove the boat) the oil pressure gauges were blinking red because the oil pressure at idle was extremely low. Boat ran 83 mph I think.

I've dyno'd quite a few at the crank and the prop. If you are looking for the actual runs I can dig some up and scan them. I've done several Mags at the prop. They ranged from 365 to 375 using standard correction factor. The HO's ranged from 390 to a little over 400. I've done a couple of before and after's on CMI installs and a mag to HO with whipple tune. Also have Raylar upgrades and a few Whipple supercharger builds. What are you specifically looking for?

That website no longer exists since I have closed the business and retired. I do still have all
the information.

Thanks, I just wanted stock 496 MAG and HO MAG dyno pull numbers especially at the crank and if all possible at the prop. Also wanted equipment info what use used to obtain those those dyno numbers.

Thanks for the replies and who can provide this.

Also stock numbers first and possible moded numbers afterwards would work to.