Never read or heard that but i could be mistaken.

 

Yes, early 4.8s had the long crank as well.

 

Just about all blocks are interchangeable, except the FWD 5.3L. IIRC, it has a different bolt pattern. The longer cranks are only longer because of a thicker flange in the rear. To my knowledge, no one makes a shelf forged crank with the thicker flange, so if you need it and you want a stroker, there are several companies that makes spacers, adapters, and special flywheels to make it all work.

Trust me when I say that the last thing a machine shop wants to hear from a customer is "well I heard from a guy on the internet..."

 

Great article to start with:

http://www.enginebuildermag.com/2010...i-crankshafts/

 

Thank you KCS, my point exatly! And thank you for letting me know that the extra length comes from the external flandge that bolts to the flywheel.

JoeNova, I want what every gearhead wants....the most cubes in the small package you got. That way people think you just got a 5.3, but when you drag their *** and they go, " What you got in that thing??!!" You can dog'em with bragging rights.

OldLady, the more you open the bore size the more it unshrouds the intake. The longer rod the more torque the engine will build because the longer rod creates leverage. Long stroke short rod creates and uneven motion on the upstroke that makes the piston want to dig into the cylinder wall and create a scoring, often mistaken for having the wrong piston to wall clearance. A man named Judson Massingil once told me, "There is no substitute for cubic inches..." Torque is directly cubic inch related and proven in mathematical theory. Strokers need the right combination and better to learn it here than on the track with your your own money.

 

I've believe I'm following you here but let me just clarify here, how well would a 4 inch crank with6.125 inch rods and 3.8 inch bore work?

 

OldLady, thats what I am trying to find out. Another fella on this thread said yes it would work. Also KSC posted a link to an artical I havent read yet. From what I hear in this forum and from reading, alot of emphasis is placed on sonic testing before going the massive 120 over. Back in the day when you went big you also filled the block and only ran your pass down the strip and shut it off. So my personal judgement would be to go half that at 60 over and see if the market has common sizes in that range. Check the common piston sizes and make a selection. The bigger the better. If you want to save some meat then save. But youll be happier with more now that less later I garuntee!

 

well this isn't exactly a track vehicle it's for my truck which won't be a daily driver per say bit it will get regular use

 

All of the factory LS blocks are the exact same size. It doesn't matter if its a 4.8 for a 7.0, so it doesn't matter. External dimensions won't change. The only place the displacement is stamped on the block is back where the trans bolts up, so they won't know anyway.

If you stroke a 5.3 with a 4" crank, you have ~359 ci. A 6.0 is 364 ci.
Not only that, but a 6.0 complete shortblock will go right in your truck with zero changes. 4.8/5.3 heads drop right on and give increased compression. You are literally money ahead just swapping in a 6.0 shortblock.

Stroking a 5.3/4.8 is just plain silly when it comes to cost effectiveness. You could buy a 6.0 shortblock for the same price as machining and assembly for the 4.8/5.3 block, not counting the rotating assembly.

 

 

Well see, I told you I was new, so i gotta get the dumb questions out of the way before I can make progress.

Thanks for answering my dumb questions.

 

He's a troll.

 

Sorry, old thread but I saw this and have to say, PLEASE DONT LISTEN LSSTANG01. SO WRONG ON MANY LEVELS.

 

Since we're replying to five year old posts....

That is incorrect. Rod length determines stroke in exactly one engine, and it is the same engine that utilizes direct exhaust injection.

 

ROFLMAO!!! New one to me! Good one.....

 

Bumping 5 year old threads ?? BRUH. and its your FIRST Post??

 

Yet, he IS right.....