Re: New Guy with Questions
 

Dave M. ran a 26p B1 when his boat had a 385HP/454MagMPI. and I ran a lab finished 26p B1 with a modified 340?HP/7.4MPI.
Both Dave and I run 28p B1s now... :D
A stock 454mag makes max power at 5000rpm so that is what you want to prop for... :drink:

Re: New Guy with Questions
 

Razor, figure out if you have a Gen V or Gen VI engine. Bulding 50HP more is pretty straight forward.
If you have a Gen V then use the Merc/Crane 420,425,525sc cam. This cam is what most guys use when building up Gen IV and Gen V low output 454s.
If you have a Gen VI engine then I would consider using the ZZ502 crate motor cam. After-market roller cams and lifters are big $$, but the GM stuff is not.
You will need to replace the valve springs to match the new cam, and the non-adjust rockers with an adjustable setup.
If you decide to have a valve job done, have the heads milled at least 0.010 to boost the compression a little.
And like we've talk before, you will need a double pumper carb and ignition changes.
Have fun with it... :drink:

Re: New Guy with Questions
 

Mine is a Gen V, non roller cam. I will take a look at the Crane cams. Is a Demon carb worth the money? Will it bolt up to my intake manifold (do they make an adapter)? When it is time to do the shortblock, I may make the change to the 502. I just want to make sure everything I look at is good for the switch.

Re: New Guy with Questions
 

Since, you have a Gen V, a full roller cam setup does get costly. I'd stay with a hydraulic flat tappit cam and add roller rockers...
I work with a fellow that bought a Demon for his car and loves it; he said it was much easier to setup than a Holley. Personally I have no experience with them.
I believe that your GM/Merc intake will except both bolt patterns and does not require an "adapter". It does require a spacer to cover the larger secondary openings meant for a spread bore carb. I think you have a 4 hole spacer under your Carter square bore carb now; if not, you should.
You could just re-jet your 750 Carter to try with the bigger cam. Merc used the same carb and intake on the 390HP/502. The only difference was the jetting and an open spacer. A 750 carb is good to about 5200rpm on a 454.
If you do decide to buy a new carb, my first thought is to buy the same Holley 800cfm carb that Merc Racing used on the HP500/502. Lots of places sell them so you can get a good deal. The Sea Demon comes 750 or 850, so if your thinking bigger cubes down the road, 850...

Re: New Guy with Questions
 

Superbabi,yes that is where the harborside is,a nice clean place,i'll be goin back next year,are you?? tripps

Re: New Guy with Questions
 

Tripps, what one were you in ???

Re: New Guy with Questions
 

Razor your boating expences have just started. better get use to it. every year you will be adding more stuff. Superbabi had a quize a while back . What does B.O.A.T. stand for ?

Re: New Guy with Questions
 

"Bring On Another Thousand"
or "Break Out Another Thousand"
or was it "Break Out Another Ten thousand"... :eek:

Re: New Guy with Questions
 

Razor, full force boating will..................SUCK YOU DRY !!!!!!.............Ahhhhhhhhhhh gotta love it. :evilb: :evilb: :evilb:

Re: New Guy with Questions
 

Super,the one that is facing the Atlantis by the dock. You can get basicly anyone you want,book on a saturday arival and you get a view of the pool,so you can watch the kids in the pool as you sip Kiliks from the baloncy :D :D :D tripps