Sounds like a nice build. I'd like to see how the Edel's stack up against the dart 308 iron head. My guess is they would be close.

That's haulin in a 22 pachanga !

I too am interested in the progress of your motor.

Either way, This boat with 600hp is going to be a big step up. From what I've researched I should hit mid 80's were my last boat only did 63.

Decisions decisions.

My 27 with a 509,stock 088 heads , Hp500 intake,carb and cam ran 68mph.. (24p Bravo 4 blade)
Same exact engine setup with a Weiand 256 set at 5lbs of boost ran 82mph.. (28p Hydro P5 5 blade)
Blower setup ran me $2000..
No heads in the world are gonna give you 14mph with no other engine changes....

+1

Wow!! That's a serious gain for sure!!

I also have a friend that has a 28 velocity with a similar setup, his boat is for sale at http://www.powerboatlistings.com/view/20204 . I will be sure to relay the new dyno numbers, hopefully there will be some kind of an increase, if anything the aluminum heads are lighter...

I agree. However if the tune is off on a high compression n/a motor it will destroy parts quickly as well. Some say a blower will show problems sooner. In some case yes, but again only compared to a low performance engine.

You also only hear the bad, not the good of guys out there running all the time with no problems.

I've every thing except intake if you want to go the 250 route. A pair of Holley 850's, fuel rails, air cleaner and linkage.

interested in just selling rails,air cleaner and linkage?

CP, my buddy Tim (posts on here as "BadDog") was running a 250 and a big, non-dominator Holley on his 509 a few summers ago. He was gettin low 80's in a Baja Force 235. He sent the carb out to Dean Nickerson for tune and setup, and bought a custom roller cam from him that was designed for the blower. The rest of the engine was pretty much stock 502 like yours - stock unported 088 heads, Lightning headers, etc. He went through a couple of iterations with that build - first he hammered a rod bearing out of it, and later he broke a connecting rod and sent it through the pan. He did put a lot of hours on both motors between builds with hardly any problems. This last time he decided he was done with the blower and built an HP 500 clone out of it. He is running about 72 GPS with it now. He will be the first to tell you that he misses the punch that the blower provides, but if you want to play, be prepared to play. Basically, you can claim all you want that you will run go easy on it, mostly cruising, blah blah blah, but as Tim famously put it, "if you had a 12-inch schlong, would you only use 6 inches of it?"

Tough choice, but you also have to consider things like hatch clearance, how much room there is in front for pulley clearance, etc. What kind of water are you running in down there where you boat? Fresh, or salt / brackish?

BTW - did you get that link for the Cometic gaskets?