I've been quoted 3k-3.5k. Milled heads, new springs comp or isky, felpro gasket, and labor.

We have a customer here in central California who has a 353 with the Raylar 103-525HP kits and CMI headers that I know has clocked consistant mid 80's at 5100 rpms. I believe his boat is for sale now with low hour and great equipment for anyone who's looking for this model and power its a great boat! Just thought I would chime in about 496's in 353's.

Best Regards,
Ray @ Raylar

I just think Bob and I bought better engineered equipment to start with. I'm at 132. By your way of thinking , you should be about ready to crack the 525s open this winter for new springs. '06 with no seals on the motors, sweet.

I like the way you think. Run'em that's what they're made for!:ernaehrung004:

I better call Dave!!!!:drink:Fast!!!

No intention of doing that, only at 100 hrs now and the 525s are supposed to go close to forever. :D But If I own it at a couple hundred I might consider a spring change then. These are sealed same as any of the others, I've just never seen any with the heads or valve covers done.

I just think that it is money well spent to maintain the valve train, and 250 hours seems to be the number Merc is stuck on. My 500s didn't make it that far so maybe I'm overly cautious of this. It's a crap shoot at best, but the more hours you run the less of a crap shoot it becomes.

I'd have to be smokin' crack to dick with these 525s. :cool-smiley-027:

Can you say super charger??? 100 mark would be something we could talk about:drink:

fastech 353 speeds
 

2006 600sc merc. maximus 32 props 86.8 MPH GPS two people half fuel. Tried a pair of Herrings same speed but smoother and less mid range porpose.

I could say Whipppppppppppppple Chargers! Or just stick with a pair of 525s in the newer staggered 35 and easily top the century mark as well. The world is full of possibilities! :cool: