Several years ago I rebuilt my 525's. Before the rebuild I Dynoed both motors, both pulled 560hp plus in stock condition. The only thing I did different on the rebuild was cut the heads and did a valve job. No engine mod, no computer upgrades. Dynoed both motors and both hit 600 hp at 5400 RPM's on the rev limiter. If I flashed the computer I might have gotten a little more but why bother.

So for very little money I think 40 plus HP and fresh motors was a pretty good investment.

The limiting factor is the intake. I took my 500 efi with afr heads, cam, mono blade, bigger injectors and was at 640 hp and 670tq on 87 octane. Ive said it before with these intakes and set ups, you cant just change a couple components and get huge gains.

Whipped stage 1 ECM upgrade for plug and play

You have them Larry?

No,,,I don,t,,,,,I believe mike with the 38 top gun ,has them,,,aka, hold on tighter, name of boat

A bud of mine had 3.3 whipples on stock 525 long blocks with custom tune, I think they were 750+ never dyno'd and they ran great for a couple years,( low hours ) went 103 in the shoot out couple years back, the 525 is not set up for a blower its EFI, they had piston issues when pulled apart, if you want a blower motor put the right parts in it, jmo

What about Raylar. They used to have a package that takes it to 750 I believe without a whipple.

Eddie did tell me if I wanted to do something do the Whipple Stage 1.

IMO, this upgrade is not worth the money. If you're going to up the horsepower on a 525, whipple is the way to go. But if you go the whipple route, you need to upgrade the valve train for sure and have it done by someone who REALLY knows what they're doing. This may be heresy, but personally, I'd never do it to my 525's. Harder on the drives. And the 525's are turnkey, reliable motors (assuming you maintain them) as is and run on any gas you put in the tank . Once you add the blower, all bets are off..