454 to 540 short block?
#11
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Join Date: Jan 2005
Location: Tri-Cities, TN
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Mild,
For a goal of 550HP a 489 to 496 CID engine will work and still give you many hours of performance with minimal maintenance.
Stroker kits for your application range in price from $1100 for mild duty parts to $3600 for top shelf parts. A good middle of the road kit will run around $1600 for crank, rods, pistons, rings, and bearings.
The 990 heads will accomodate that kind of power with no problem. I would suggest changing over to Hyd roller cam and lifters which will give you many 100's of hours of service life.
For a goal of 550HP a 489 to 496 CID engine will work and still give you many hours of performance with minimal maintenance.
Stroker kits for your application range in price from $1100 for mild duty parts to $3600 for top shelf parts. A good middle of the road kit will run around $1600 for crank, rods, pistons, rings, and bearings.
The 990 heads will accomodate that kind of power with no problem. I would suggest changing over to Hyd roller cam and lifters which will give you many 100's of hours of service life.
#12
10x
VIP Member
You are right Frank. My boat originally came with 400HP mercs with 3" cast iron logs. I ditched those last spring and went with the Cast Iron "420HP" manifolds with the Gil tail pipes. An improvement over the 3" for sure, and I would think still better than the 4" standard merc iron manifolds. The guy I got them from ran them on a pair of 550HP 496's. He then swapped them for a set of CMI headers, and he noticed a slight increase in the midrange, but not much on top. The drawback is the wet joint that is prone to leaks. Mine have been ok, but none the less, a pair of aluminum manifolds would be nice. Not too mention the weigh savings, these suckers are HEAVY!
My boat tops out around 58-60 right now, Id like to see 65 or so. Who built your motors Frank? They sound sweet, and I know that thing runs!
My boat tops out around 58-60 right now, Id like to see 65 or so. Who built your motors Frank? They sound sweet, and I know that thing runs!
If I were you, I would really seriously think of at least talking to him about your situation. He's gonna tell you the truth if it's good or bad, and sometimes he kinda bursts your bubble, but the one thing he will not do, is give you an uneducated guess of what you need to do to achieve what you're looking for, or sell you a pile if crap that you really don't need. There's "too many" scammers out there that just want to get into your pockets for the most they can. He's not one of them.
Daves shop # 616-662-2250....... tell him you're another one of the "chicago" guys from Diversy. He'll take real good care of you, I'm sure. He already builds and maintains the boats for Austin's 47 Apache, Mike's 47 Fountain, Chads 41 Apache, Mike's 38 top gun that was bought by one of our club's board members (Jamie), Chi Town Hustler, big Rick's 2 46 Cig rough riders, one that's getting a pr. of 1200's in it, the one that we had in the harbor last summer, and another one that he just bought last month that's getting a pr of 1300's built for it. And of coarse, my boat should it need any "serious"
attention.
Good luck on whatever you decide, but remember it's going on the end of march, and there's not much time left to finish a big project befor summer.
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Fountain powerboats rule "The Preacher"
Chicago Powerboat Club Director
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Fountain powerboats rule "The Preacher"
Chicago Powerboat Club Director
[email protected]
www.chicagopowerboat.com
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