Avs38

iTrader: (1)

Pulled stock 502's and considering upgrade to 525's. Anyone else done this? Will they fit properly? I need to purchase exhaust, suggestions? Hooking onto the Bravo one drives, shouldn't be a problem? Any prop advice? Was running the stock bravo 26... Thanks for help!

5050

[ATTACH=CONFIG]512931[/ATTACH] fit just like your 502 efi. Both 502 bbc. This 525 is on ebay

Avs38

iTrader: (1)

Thanks 5050. Any prop advice? I see you have the same boat, not sure of your power... 16500 seems rather cheap for a "new" 525.... I've been getting that price on rebuilds

dandercam1

iTrader: (1)

For the kind of money you will spend on merc 525 efi's you have allot of other options. 5050 is going the GM ZZ572 rout which is great bang for your buck option. Or how about something like this?

http://www.offshoreonly.com/classifi...o51513-en.html

If factory warranty is what your looking for the new Mercury racing 520 would be worth a look


http://speedonthewater.com/new-boats...new-520-engine

5050

Well my boat was under powered like yours and mine had 26 bravo 1 that were spinning 4900. Im going to try 28 with my 572 to spin motors 5700. My guess is with 525s probably a 28 or 30 pitch spinning 5000/5200. Im sure someone will chime in with actual props and motor combo.

Avs38

iTrader: (1)

Thanks for feedback

wannabe

5050; Are you going to reclearance the engines? The zz572 is a great starting point- just I would suggest looking at valve guide clearance.

Wannabe

jeff32

was curious to know if those 572 you are talking about are really the crate engines? you are using them completly stock?

5050

Bought both of them slightly used, smokin deal. They look it too. I'm tearing them down over winter checking clearances, torque plate hone, rering, bearing, switch ferrea exhaust valve out to ferrea inconel, maybe a little head work and angle mill slightly and dyno tune. Hopefully right around 700 Hp

5050

Yes they are zz572/620 crates. Callies crank, j&e pistons, ferrea does valves called ferrea and talked to a tech guy that actually handles that department with GM, not sure who does H beam rods, heard Callie's and also heard eagle so not sure on that. Definately good parts. Using same cams. Changing out exhaust valves carb and distributor. [ATTACH=CONFIG]513044[/ATTACH]