I am considering boreing my 350 .090" over and installing a 3.875 crank, in order to achieve a 396 SBC. Will this work, will I have serious cooling problems? I won't be running it WOT very often, so just keep that in mind. Would a 4" bore x 4" stroke work in a 350, to get a 404? Thanks guys

 

It will work if everything is clearanced properly. A cooling system in good working order will cool it no problem. A 3.875 stroked 350 is very close to a 383 in demension, so cooling & building tactics would be the same.

 

.090 over? Gettin a little thin there dont ya think?

 

Good luck finding pistons.

.060" is generally the most that people take a 4.000" bore over. And that, it isnt safe without sonic testing. This is one of those "just because it looks good on paper, doesnt mean it works in reality" things.

Theory and technicality are two very different things in the automotive world.

 

You don't need to go .090 over to get a 396. If you to go that far look for another block. While you are at it look for a 400 block, they start out with a 4.125 bore. That with your 3.875 crank will get you a 415.

 

While youre at it, just punch out the mains and make it a 454.

 

No crap! LoL


Or just spend half the money and but a real 396, 402, or 454 . Then you will fear no turbo.

 

Here is a 396 for you.

http://www.moreperformanceinc.com/

MORE PERFORMANCE 396 L98 SHORT BLOCK
-4.030” BORE, 3.875” STROKE, 10:5 COMPRESSION
-BLUEPRINTED L98 BLOCK

CYLINDERS BORED TO 4.030”
CYLINDERS HONED WITH PLATES TO FINISH SIZE
DECK MACHINED AND SQUARED
BLOCK DEBURRED AND CLEARANCED FOR STOKER
ALIGN HONED
BALANCED INTERNALLY
CAM DEGREED
-PROFESSIONAL ASSEMBLY
-CALLIES 4340 STEEL CRANKSHAFT
-LUNATI PRO MOD 4340 STEEL CONNECTING RODS
-JE FORGED ALUMINUM PISTONS
-FILE FIT MOLY RING PACKAGE
-ARP MAIN STUDS
-CUSTOM GROUND HYDRAULIC ROLLER CAMSHAFT
-COMP R SERIES HYDRAULIC ROLLER LIFTER
-COMP DUAL ROLLER TIMING CHAIN SET
-COATED FEDERAL MOGUL HIGH PERFORMANCE MAIN AND ROD BEARINGS
-DURO BOND COATED HIGH PERFORMANCE CAM BEARING SET
-MELLING BLUEPRINTED HIGH PRESSURE OIL PUMP WITH WELDED PICKUP
-HARDENED OIL PUMP SHAFT

TOTAL PRICE: $5699.00 not including tax or shipping. (Core is required on the block)

OPTIONS TO THE ABOVE PACKAGE:

-L98 BLOCK $400
-CUSTOM PISTONS AVAILABLE FOR SUPERCHARGED AND NOS APPLICATIONS add $280
-PISTON COATINGS $280
-SPLAYED MAIN CAPS $600 (INCLUDING MACHINE WORK)
-CANTON OIL PAN $329

 

Just find a 400... its 4" more than a 396, and a whole hell of a lot cheaper to build. If you really want huge inches though, just get a big block, like a 427 or a 454.

 

.090 overbore AND a stroker crank?? Well, I 'd say it's unique. Must be a reason why it would be....

Get a 400 sbc and be done with it. Unless unique is your thing, then go for it!

 

If you want big displacement there are a lot of different routes to follow.
With the SBC you need to be aware of the limitations. At a certain point you'll reach the line where you could go bigger, but it would be senseless because you'd have to start ordering expensive custom made parts that are not only costly to purchace, but are compromised in durability, in addition to having to do a great deal of custom clearancing to make room for the big crank to spin.
The stroke limit that most builders agree upon as being the uppermost for the std 9.025" deck SBC is 4", with a 6"rod, and a 1" comp ht piston.
With a 4.0" bore that will give you 408ci with a 4.125" bore 427ci.
Larger than 4" stroke and there become severe clearance issues, such as the crank colliding with the camshaft and the sides of the block.
There are larger sbc cranks on the market, than 4", and larger SBC blocks designed to accomodate those larger cranks, with additional clearance between the oil pan rails, a camshaft that's spaced further away from the crank and additional height built into the deck.
If you're looking for something to daydream about, do a search for Dart Rocket Block.
I think one of those will take about a 4 1/4" stroke, combine that with a 4.155" bore and you have 461ci.
And as long as you're dreaming, reach for the stars... they make an aluminum one for about $4000.
I dream about having one someday.
Knock yourself out, check out "what could be"
http://kb-silvolite.com/calc.php?action=disp

Meanwhile 3.875" is a stroke that's do-able in the std deck SBC, but it's easier to order pistons that fit a 383 or a 400 for that matter. It's an odd sized stroke.
Another thing, don't go bigger than .040 over on a block that you've got all sorts of $$ tied up in. It could be a regrettable decision.

 

Since everbody is dreaming here:

http://www.theengineshop.com/feature0307.shtml

 

Would it be easy to find a bbc in a junkyard? Cause that is what I really was wanting, just was not very optimistic, due to low funding. would a 400 block be easy to find outta a junkyard? I'm 17 years old, the money is good for my age, but still I only got like 2000 bucks for tranny and engine together, so let me know.

 

Hah!

Horse Power TV just had a Scott Shaffirov custom built 472 cubic inch small block on the show maybe 3 weeks ago. It put out in excess of 650 hp in street trim

 

2k will barely build a 350.

Actually if you read your local paper you can find older trucks cheap and complete with either BB and sometimes 400's. BBC's are very easy to come by, seen a 72 for sale with a 402/TH400 runs $600 today, cant beat that.


I actually took the 396 in my 66 out to a 427, I hate to see a built one in a unibody, it would be fun for a little while.

 

400 small blocks are not common anymore at all. Your best bet would be to go to a reputable junk yard and buy a 350 that is in good shape for maybe $700 or $800 and then spend a few dollars on a set of headers and a good exhaust system. With only $2000 to spend you really don't have many other choices. Besides, a nice 350 will keep you satisfied for a few years

 

Oh yea, You'd need more than a little chassis tweaking... that way you don't crack your paint when the secondaries open up

 

Since we're dreaming....how about a 394???

over 1000 HP, runs 8.43's in the 1/4 at 165 mph.

http://www.turbobuick.com/chris_chow_car.html

 

Well for starters, you have a 350 which is a good thing, but if you're thinking about a rebuild, your $2000 won't get you far.
I'd suggest putting the idea of a stroker on the back burner, and just focus on building upon what you have.
Is it worn out?
An 86 350 has some potential to begin with. If you invest in bolt on parts that will also work on a later build, that seems like a better strategy.
I'll assume that yours is a TPI
A good place to start would be to invest in some reading material that explains your stock fuel/air system and make a list of tools that you'll need to begin servicing it. Cause ultimately, no matter what you end up with, you're going to have to deal with that obstacle before you'll have a good running car anyhow.

 

Nah it's carberated, the Quadra Jet is about shot, I think I will just buy a rebuilt one for now, because I don't know yet what mods I am gonna stick with, and really I need to know my cfm and hp ratings that I am going for, before I purchase a nice edelbrok.

 

That's fortunate for you.
Your $2000 will get you further with a carbed car than TPI.
Since you don't have to smog either, that leaves you with a lot greater leeway.
If you shop smart, you ought to be able to get an exhaust system, a new carb+intake, and a cam.
That will wake your car up