408 Stroker

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but you could also build one with 3.91" bore x 4.25" stroke...same displacement. Not that i´d recommend it....:D

Michael
 
A 340 with a 4" crank and a 4.07" (.030 over) bore is 416". How big depends on what crank and bore you use. It's easy to figure, bore X bore X stroke X .7854 X the number of cylinders.
 
Plymouth Power said:
So what do you end up with using that same crank in a 340 block? How do people get up to 416 and is that the biggest ci size that can be made using an LA SB?
Click to expand...

I think the biggest that's been done often and run and proven. Is 440. Out of a R3 block. A 476CI build is mentioned in "How to hot rod small block mopars". I've heard of a few guys doing it. But haven't seen it yet myself. I think it's something that high end one off engine shops are doing to prove they can.
 
There are several in the 420-450" range on Moparts. Ron Silva built a 501 or 502" several years ago.
 
Plymouth Power said:
So what do you end up with using that same crank in a 340 block? How do people get up to 416 and is that the biggest ci size that can be made using an LA SB?
Click to expand...

You can also take the .030 over 340 (4.07) and stick a 4.125 stroker crank and end up with 427" or the 4.25 crank in the same block for Aprox 440".
 
I guess they dont teach math in schools anymore...lol
 
lol....:D

nowadays school is more about using your smartphone ;-). bad if you don´t have the correct app..
 
422 is the 4" stroke with a 4.10 bore. (340 +.060 over) You can fit a longer stroke in a factory block but do your homework.
 
Plymouth Power said:
So what do you end up with using that same crank in a 340 block? How do people get up to 416 and is that the biggest ci size that can be made using an LA SB?
Click to expand...
4.04 cherry bore 340 makes a 410 with a 4" crank. (or .040 over 360) 416 is typically a 4.07 bore.

Close to 4" bore about every .010 should increase displacement around 2ci. Decent estimation anyway.
 
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