like the title says...im just wondering how a 366 is made using that size of crank...destroked 400? or just destroked 350 and bored over?

 

It requires a 4.125" bore which is the stock SBC 400 bore.

 

so this is only possible with a 400 block?

 

Exactly

 

i just read that Dart offers a 350 block with 4.125 bore....does this mean if a 3.425 stroke crank is used it would be the same 366CID engine?
who even makes a 3.425" stroke crank?

 

What's magic about 366 CID?

 

it definitely gonna make power but it gonna be a little shy on torque which would be excellent on a street engine, hopefully it doesn't kill on the launch though due to the stroke

 

A 350 block with a 4.125" bore is a 400 block with a 2.45" main. A 3.425" stroke crank for a standard 2.65" main 400 block wouldn't fit.

 

It will make about as much power as any other combination of bore and stroke resulting in a 366 cubic inch displacement. It will also make less power than would be possible by using a longer stroke crank in a 4.125" block.

 

Apeiron, doesn't more of a stroke add more torque, hence why a (chevy)302 makes gobs of horse but lacks a little on the torque, but a 305 makes less power but with the standard stroke makes decent torque

 

Not really, the increased stroke is offset by the reduced piston area. The Z28 302 made HP because it had a solid lifter cam and induction system that would allow it to spin faster. The 305 is a smog dog with a cylinder bore too small to allow the heads to breathe effectively at high RPM.

 

it was an example apeiron i could have sad a 350 as well as a 305, my point was doesn't a longer stroke generally create more torque over a larger bore which creates more horsepower. Granted increasing stroke increases horsepower, but not as much as bore

 

 

366ci = 6.0L... maybe he's limitted to 6.0L for a specific racing class?

 

cubic inches are cubic inches. It doesnt matter how they're acheived you'll get the same results.. big bore small stroke, small bore big stroke, it doesnt matter. You wont make power any differently.... it's all about how many cubic inches you have at your disposal, end of sentance.

edit: this is one of those myths that irk me. Just like the "yeah, I dont think I can go 4 inch exhaust, I wont have enough backpressure", that one slays me.

 

yeah sure having a long stroke small bore vs a short stroke big bore might make some difference in where the rpm range is due to mechanical leverage, friction, g force, sidewall loading, intake velocity and intake pulses for carbed cars and such and might even make a small difference on what rpm the motor can spin to. BUT those aren't going to be the main factors. more import factors would be valve timing, lift, valve size, port size, stuff like that
the bore x stroke is a very small percentage of where the power comes from and what rpm range it works in

like take that chevy 302 and put the same style cam in it as what is in the 305 tpi and it prolly would have about the same power curve. setup that 305 like the 302 was and it should be fairly close to the same
the biggest difference between the two is going to be on the 305 air flow is going to be limited at higher rpms due to the smalle bore which leads to smaller valves and/or valve shrowding. but stroke isn't going to play that much of a factor into it.

 

so what you are saying is that a 3.425 crank can not be used in a 400 block (400 main bearing block)? the shortest stroke crank i could use in a 400 would be a 3.750?

 

No, you can use pretty much any stroke crank in any motor as long as the main journals and the stroke fit in the cylinder case (block).

A 4.125" bore block with a 2.45" main journal size is no longer a 400 block; it is purely an aftermarket creation.

Again why do you want a 366?

 

They have stroker cranks for 350's that will also make 366 Scat and a some other companys make them a 3.625" stroke and a 3.562" stroke

 

well im deciding between a 6.0/7.0 just trying to get some info...

 

But why are you deciding between 6.0 or 7.0? What's the application?

 

Common you have been around long enough to know as well as I do this isnt going to happen.

 

6.0 and 7.0...bracket racing? you run in SCCA or something? If not just build the biggest displacement motor possible, though the ability to rev is also very good. Take your pick man, but i would be increasing stroke.

 

Once again... the ability to "rev" has nothing to do with stroke.

 

no i have no restrictions nor do i plan to run in any restricted type of racing, just curious... tryin to make a decision between some things

 

Pipe Dreaming

 

Build the biggest motor you can get your hands on. Don't start farting around using uncommon strokes. Just use common stuff, so you can actually get off the shelf parts.

 

just get a world motown block, bore to 4.25, and a crank with 4.25 stroke, and have a 482, 7.9L small block

or go big block, and you can do a 712, 11.67L

if thats possible, i just looked up lunatis biggest crank and the biggest block on summit

but those arent very cost effective solutions, but a very good pipe dream none the less

edit: C Murda, whats rare and wanted that you have?