502 zz crate motor?

[onery2max]

Help I Am Building A New 21 Foot Tunnel. I Am Putting A New 502 Engine In. I Have Some Guys Tell Me To Use The 502/450 Horse With Cast Heads Instead Of The 502/502 Horse With Aluminum Heads Because Of Corrosion Concerns. This Will Be An Open Water System But It Will Have A 2 Stage Thermostat Setup Also. What Do You Know? Thanks

[Jordy]

If you're running it in fresh water I wouldn't worry too much about it. Salt would be another story though.

[TPI]

If you're running it in fresh water I wouldn't worry too much about it. Salt would be another story though.
Ditto...........Aluminum heads are the only way to go these days, if its close cooled or in fresh water only.

[franky]

Go the 502/502 route but take it apart and machine (deck height, align bore and hone) and balance it the way it should be. Also have the sever duty/ inconel valves installed. If you bump up to say a Comp Cams #11-000-09, 850 Holley, Dart manifold, decent roller rockers, ARP bolts, you will see closer to 570 HP that is reliable! Factory machining sucks. Good base inards: forged crank, good rods, JE Pistons (except those funky metric rings), just shoddy machine work. Been there, done that.

[onery2max]

Hey I Appreciate Everyones Reply. I Have Ordered The 502 Zz Should Have In A Few Days. Any Other Questions Or Comments Please Reply Other Wise Have A Great Holiday Season. Thanks Onery2max