Don't know jack about a BBC, please help
 

I've got a friend that's got a 330hp 454 now. He's looking to add some horses and needs some help. I'm still learning SBC and don't know jack about BBC stuff so I'm gonna ask you guys for some help. This should be a fairly simple build as we are looking to get between 450-500 horse power in the end. Here is a list of goals we have and if you guys could please chime in and let me know if this is doable or not. Please feel free to suggests parts as we go:

1. Only thing that will be reused is the block (besides ignition and accessories etc)
2. Can we get this power with iron heads or do we need aluminum? (please feel free to make suggestions on proven heads)
3. Needs to be some what mild mannered around the dock and what not
4. This is not a race boat and never will be, still gets used for tubing, skiing, partying, and cruising. Needs to have good midrange capability and good power up top for the occasional WOT run
5. He has under platform exhaust. Would prefer a cam that will work with stock style short risers (please feel free to make cam suggestions)
6. It's a 1990 model engine, is it a roller cam setup or no (if not can it be converted)
7. What size carb?
8. Single or dual plane intake? (again suggestions welcome)
9. Would a forged rotating assembly be necessary or would cast work?
10. What would be a safe and reliable rpm range for a BBC of this nature?
11. Last but not least... Can this be done for under $7000?

Sorry for the list of questions that have probably been asked 1,000 times on here, I'm just trying to keep all my info in one spot, makes it easier for me to recall it this way.

If you feel that I missed anything feel free to add info as well

Buy a complete engine, it would be cheaper than what you are talking. Seriously.

Even if we shopped for deals on good used parts? I'm not arguing, just curious as to what it would take to build something like this

To get what you are looking for and to get 500hp is going to require some money, I don't think the 90' is a roller motor either. You also state you want it to be mild mannered, so in that case you should do a stroker. Find a take out 496 or a mild 502 and save yourself the time and hassle. A good benchmark is the 454/420, really to go past that with the needs you describe, you need to do a roller conversion.

Good Manifolds
800 or 850 carb and matching dual plane intake
Run probably 5500+rpm
Rectangle port heads (or quality aluminum set of your liking)
Roller conversion as you'll need a nice cam and matching valve train to support some higher lift #'s
Crank
Rods
Pistons

I mean if you are really replacing literally everything, just buy the whole thing done already.

Either that, or really lower your horsepower goals...if you want it reliable and tame like you describe.

Even if you get deals, I'd say you have AT Least $4-5k in it, and a pile of parts that need to matched/machined/assembled/tuned/tested, and of you buy all used, probably a few surprises along the way...just my take.

THe roller conversion on my 502 ended up costing about $1500 when I had all the stuff needed to use the cam I wanted.

I figured it would be a little easier to get 1 horse power per cubic inch on a 454. Shows what I know :lolhit:
Glad I asked, I believe we will start shopping the "already assembled" isle at the engine store :party-smiley-004:

dave,i recomend finding a used hp500 and rebuilding it,they are iron head motors,8.75 to 1 compression,and hyd roller cams,and idle around the dock all day long,just my thinking.

Already hunting. What kind of hours can you put on these before they need a rebuild?

[QUOTE=87MagnumII;3774878]



Yes it could certainly be done for under 7K.
5200 rpm
Forged crank and pistons
Dual plane Edelbrock RPM air gap
750 holley or edelbrock carb
1990 should be a Mark IV so no roller.Can be converted.About $1200 to set up a roller(Cam-Lifters-Springs-Pushrods)
Could work with the right iron heads.
Exhaust is going to be your problem. For the power you will be limited to with that exhaust you may as well keep it stock.

I agree 100%. Re-reading this I really sound like a downer, so let me say this, can it be done, absolutely. However, I've seen so many people dunk more money in a 454/330 and almost always I think to myself, you could have had <something way nicer than they ended up with> for that. If your goal was 380-400hp it's a totally different conversation.

This is a loaded question, huge variety of answers here, some will tell you a million, reality is, if you get one with more than 250 hours on it you should just go through it. Everyone can chime in and tell me I'm nuts now :)

I just went through the top half of my motor and replaced the springs etc. since I'm hoping to get 500 hours out of it before I rebuild completely. Some may call that overkill, I call it cheap insurance...

I know horse power takes money, I'm gathering bits N pieces for a 383 for my boat now. We would be miles ahead if he was starting with a MAG motor but it's not so I'm thinking now we need to find a good drop in like you guys suggested and put the 330 on the shelf for a spare. If you guys come across anything decent let me know, not really in a rush, but it would be a fun winter project to get the ball rolling on this

I took a gen 6 block (roller cam block) and used the stock crank, stock length scat rods, Probe forged pistons .60 over bore small dome pistons, custom bob madera roller cam, crane gold roller rockers, a set of ported large oval ports, dual plane intake, and a 850 demon carb and made 450 hp and 512 ft/lbs torque on about 9.5 to 1 compression. I also have dry exhaust so I didn't have to worry about reversion with the cam. I have since switched the heads to world 320 cc heads so I am figuring maybe closer to 500 hp now. I don't have anywhere near $7,000 grand in this motor. The way I see it the cam will be the limiting factor for you due to the exhaust but you should call Bob Madera and he can tell you how to get hp you want on a tight a budget.

He doesn't have the crank, the rods, or the roller motor...big difference.

Pretty much agree with what others have said. Your 330 doesn't have any of the good parts you would want to get good HP. It would be a little different if it were a Magnum motor. Best thing is to sell the 330 motor and do one of 2 things. Either get a 454 Magnum motor and go the blower method, or look for a newer 496 or 502 and start with that.