I am looking into putting a l86 crankshaft into my l83. I know they are the same stroke. The only difference i can find is the 6.2 crank is forged and the 5.3 crank is not. Has anyone looked into this or done it? Its for my 2017 Silverado. I have a Whipple on it now and will be adding forged pistons, rods, Frankenstein ported heads, custom cam and more boost. I dont know if it is needed but it looks like they are pretty cheap on gm parts direct. Its my daily driver and one benefit would be i can have the rotating assembly balanced before i take my current motor apart. So when its time i can just pull my motor and install the new parts and put it back in.

 

I’d call www.paceperformanse.com ask ask em.

 

What did you find out? I've got an extra l86 crank that I need to have turned. Wasn't sure what to do with it yet.

 

I have not done anything with it really. Just read up a little. From what I have found it will go in but it requires a different flex plate. Has the same stroke and bearing journal sizes.

 

I had no idea the crank was forged. Just googled and gm's website says it is. On all cylinders says so as well, both of those places are trustworthy.

That's crazy. And awesome. But weird. I thought they only did forged cranks in OE boosted applications.




https://gmpowertrain.com/engines/6-2l-l86.html
https://www.onallcylinders.com/2018/...am-specs-more/


Being that the L83 and L86 use the same transmissions the flex plate/converter deal should be easy to figure out.

 

I read that all Gen5 cranks are forged. Not sure how true it is...

 

I'm wondering if GM found a low cost forging process AND/OR supplier in order to facilitate standardizing forged cranks across the board, if indeed that is true?

 

The l86 has forged crank and cast nodular iron main caps.

https://gmpowertrain.com/engines/6-2l-l86.html

The l83 has a cast crank and powdered metal main caps.

https://gmpowertrain.com/engines/5-3l-l83.html

Also the center of the 5.3 crank doesn't support a typical throw out bearing/bushing, it won't bolt up directly to a manual, you need a spacer.

 

Well...there ya go.

 

Yeah saw the same thing about the L83 crank yesterday when I went looking.

Just gonna add this to another reason to do a L86 swap in my truck. Not that I need a forged crank but it will make me feel special to have one lol

 

Might as well get the main caps too!

 

At this point I just want a stock 6.2 with mild cam over my 5.3. I doubt I'll ever build this thing bad enough to need any bottom end upgrades