im wondering how many cubes i can get out of a stock 400 sbc and how. it probably wont ever get done...just curious

 

434 is about as much as you can squeeze... .030 overbore and 4" stroke crank.

Bret

 

well what sbc is those 454 and 498's based off?

 

The aftermarket blocks from dart and World products can be had in 454. I would assume you would have to use a deck plate to get the 498, just speculation though.

 

Sonny's has done a 502 sbc but it's proprietary- no instructions on exactly what they did to pull it off. Anything over 454 and the price jumps dramatically, I would expect. I'm sure they used an aftermarket block, or at least something with a tall deck and thick wall casting.

 

They moved the bore centers with sleeves and ran a stupid large bore in a SBC.... probably around a 4.500-4.550" bore center.

Bret

 

so where would i get a 4 inch stroke crank? what rods would i have to use? im kinda wondering price now. would be fun to say "yeah its just a little small block" but have 434 cubic inches under the hood

 

eagle makes them

 

So,,

What would be a great pumpgas Street/Strip setup at 6800 rpm max and good ole ODBI ECM?

434 Dart at 12:1 compression
Some Honking 300+ CFM Aluminum heads - Brodix 18
Reasonable EFI friendly solid roller cam

Just need to figure out how to get an opti signal for LTCC system.

Me want one!

 

Just about every crank maker out there offers a 4.0" stroke crank these days. Call and ask if you're really curious.

You can build a 454 small block on an old block but the block has to be perfect. If you had 10 blocks to check, you might find one that'd make it. Otherwise, 434+ ci small blocks are the realm of aftermarket blocks. Most every aftermarket block will go 4.2" on the bore and the spread pan varieties will accomodate a 4.125" stroke crank with no clearance work.

You could go 4.25" stroke but once these engines start to become "over square" getting the power out of them becomes alot tougher. If you plan on building a 427-434 on a factory block, make sure you use the right rods. Lunati, Crower and Oliver all have rods with great stroker clearance. Don't know much about the less expensive Eagles and such listed as "stroker" rods. That's where it pays to find a builder who has experience building this kind of engine.

-Mindgame

 

Why ya all stuck on cubes? Cubes in a small block just cost money, money that most don't have, and that they should be spending on what actually makes power.

700+ HP is doable on a 383 with 23° heads... unless that's not enough don't worry about huge cubes, and huge strokes.

Bret

 

Bret,

I'd love to compile a list of all the 700+ hp 383's with 23º heads from this forum. That list would probably entail a single digit from the binary system.

Especially if we narrow the field to NA. For nitrous builds looking to 700+.... why spend all the money?

-Mindgame

 

True...

But with the raised port 23° stuff out there, big power N2O motors are much easier to build, and save cost in headers, pistons etc... 15°, 18° and SB2 stuff all runs so much more money for the customer in the end.

Bret

 

My intention with cubes is... more cubes... less fuel requirements and sometimes less cam requirements to make the power.... which makes it more of a livable car....

Why did gm went with a 427 for a measly 505hp?????

 

Don't forget, a bigger engine needs more air. Price out some heads that flow in the 300+ range or you'll just be choking the big engine.

Those really big small blocks use an aftermarket tall deck block to get the extra cubes. 434 is common and 454 is considered extreme. Anything bigger than that and you might as well build a BBC for half the cost.