BBC or SBC with blow thru set up?

[TopNotchSWB]

So I am debating this very hard. I have never owned a BBC but I will tell you that there is a sound like no other when its an aluminum headed BBC with a solid roller and dumped mufflers. Since I have a SBC 355 in right now I was planning on doing a blow through set up until this motor blows then drop in a BBC and do the blow through since I will have everything else, just need to get new manifolds and fix the piping.

My question is this should I stick with the plan I have or drop in a BBC with a roots 8-71 blower and cruise around with no hood?

This truck is made to go out and have fun not be the fastest thing out there. ( I am building an LSx 03 Silverado with A/C and P/S for that )

Ideas and opinions are greatly appreciated guys.

[Allensracing]

so the blower is just for show?
a big block can easily make 600+ hp that is extremely streetable without a blower if your just wanting the looks and sound, certainly use a 8-71 bb

[TopNotchSWB]

Yeah the blower just for show. I just don't want the hassle of tuning a blow through set up. Plus I will finally be able to say I got a big block in it. This truck is not going to have A/C or anything. Just cruise and show and maybe some bracket racing occasionally. I wanted to turbo charge it but my 03 has a 5.3 LS motor in it that is going to get boosted.

I wish I could start a poll

N/A BBC
or
Blow Thru SBC

[vin63]

I guess i'm not sure what you're asking - are you referring to running a centrifugal supercharger with a blow through carburetor? I'm more of a roots blower person and have no issues running it on anything. Aside from the initial capital cost of acquiring and setting up the supercharger (about the same for a roots v. centrifugal), you do not need to run a blowthrough carburetor(s) on a roots style blower. Obviously, it can be a lot cheaper building a naturally aspirated BBC, especially if your ultimate goal is to run a BBC.

[Allensracing]

here is my opinion. nothing sounds like a bad-ass blown big block.
however, unless your extremely talented with blower motors, it will probably never run right.
on a street legal street driven vehicle, you can build a virtually maintenance free normally aspirated motor with as much street usable power as a blown motor will provide for the same amount of money. you could build a 10:1 compression big block with no blower, single carb, and make 600+ hp and run 9 seconds in the 1/4 mile

[TopNotchSWB]

Sorry guys I should have been more specific. I wanted to build a blow through TURBO set up on the 355 small block I got in right now. But I was contemplating building a mild BBC with low compression with a nice cam to run around until I finished gathering the parts to strap on a roots blower.

I have been looking around all morning and as much as I want a big block, its so much cheaper to build a 6.0 LQ4 carbed with a cam and heads to make about 600 HP.

What is you all's opinion on a big block vs an LS motor carbed?

[Super73]

What is your budget for this set up (since you have a couple irons in the fire)..

My 418ci LS1 all said and done probably cost $10k..
Shortblock $5,000
Lifters/Cam/Pushrods/timing set $850
Heads $2500 (AFR 225 with light weight intakes and titanium retainers)
Misc covers and oil pan $200
Coil packs $100
Oil Pump $100
Pulley $200
Intake $400
Throttle Body $550
Injectors $300
Computer and harness $350

Given it is fuel injected so there might be a little more money there. You can go inexpensive with a pull out but a stock 5.3 or 6.0 isn't going to compare to a built big block.

That probably didn't help much did it?

[au03z71]

Believe me, pick one and go with it, otherwise you're going to be wasting a ton of money. I'm building a turbo 385 right now with a Garrett TV7301 turbo and I can assure you, it isn't for the faint of heart. First you're going to have to find a decent turbo (which can range from $450-$2500). Then the BOV and Wastegate (Plan on spending between $400 and $600). Then the headers and hotside piping ($1000 easy). Then the cold side (can be done for around $400). Now to the motor itself...I just ordered a quick fuel 750 cfm blowthrough and an Aeromotive A1000 with regulator for $1360 which is a good deal if you do any shopping around. And don't forget the bottom end with forged rods, pistons, and crank will be around $2000.

I assume you probably won't pull out all the stops building a turbo motor, but I just don't see the point in building 2 different motors with the intent on running the first one to failure...

If I were you, I'd either:

a) build the 355 with a big turbo (Something with a 1.00 - 1.32 A/R) and stick with it.

or

b) build the big block with a big turbo and stick with it.

Just my $.02

[ripdog28]

IMO, Get a BBC. You will not regret it. I have a very mild cam in my 462 and run 91 octane. Yesterday, at about 40mph i gave about 3/4 throttle and i go sideways for about 50yards before letting off. If you plan on a turbo later then just do a 9.0-1 comp from the start. You can have a 600hp BB for about $5000. My brother had a 400hp 350 in an S-10 and even that was not as scary as this can be. If your dreaming of a BBC in the future, why waste the $$ now on a SBC?

[Allensracing]

when building with factory parts, a sbc is the king of cheap.

when building with aftermarket parts, its really hard to beat a normally aspirated bbc for power/money

I remember when a used set of bare aluminum heads for a bb was $2000.
now you can get a brand new fully assembled set for $1000

[scikotic67]

go boost, turbos are more efficient than superchargers as they use spent energy to generate more efficient power rather than stressing your motor with belts and pulleys, also you can use a properly set up turbo system to get you better gas mileage, and they sound way better.

[69trk]

how about a twin turbo duramax, just thinking

never mind, that would cost alot!!!