Hey guys, So I am getting down to the nitty gritty of my build as I am about to assemble my engine and need some questions answered about parts and installation.

So the crank that is going in this stroker lq4 block is a 58x reluctor crank. Now I had previously bought an ls2 timing chain but I am confused how this works now with both the sensors and having the ls3 top end. I know I have to switch the crank sensor to a 58x sensor, but is that all there is to it? Just buy the different sensor and put it in the block? I am running a Msd atomic efi, meant for the lq4. Can I just reprogram the sensor as being a 58x?

Also, I am looking into my cam now, with the 58x wheel I see my bolt pattern on the cam I have to buy changes to a single bolt?? Does this change my sprocket or my cam gear, or my timing chain? I have an ls6 pump ready for install as well, I hope I can still use all of these components.

Sorry, very confusing and I have tried to search but not with much luck.

Thanks guys!

 

The msd atomic efi is supposedly "self-learning" when it comes to the reluctor wheel.

There are timing gears that allow you to swap cams and still use the ls2 timing chain.

Ls6 pump should work just fine.

Good luck with your build, and let us know how it turns out.

 

Ok, so does that mean I can plug the 58x sensor from an LQ9 in above the starter and then use the stock camshaft positioning sensor for the LQ4 and the engine will run properly?

 

no you cannot run a 58x crank reluctor with a top mount gen 3 cam sensor. You need an ls2 front cover with the cam sensor in the cover and then a 4x cam sprocket.

 

Well that is frustrating,

So the only way to avoid buying a new front cover, sensors, etc is to use the 24x crank?

 

Can John save time and coin by using the Lingenfelter 58x to 24x converter box? They pop up in used classified regularly.

http://www.lingenfelter.com/mm5/merc...3#.VecWBc9RGUk

 

I don't think this piece will work with the top mounted camshaft positioning sensor

 

No because thats meant for a 58x motor in a 24x car not mix and matched parts. It would be cheapest overall to have a machine shop or somewhere like Texas Speed swap the reluctor to a 24x.

 

Well as my motor is not assembled yet, I am just going to take the crank back and order the equivalent crank in 24x. That should alleviate my problem, correct?

 

correct.

 

You just need the reluctor wheel swapped out, get a nice billet wheel and have it tac welded in place as well. Easy fix since you aren't together yet.

 

Ok, well I think I'm just going to get the prper crank and not have to worry about the welding or balancing or anything.

Now, in terms of Cam gear to use a 3 bolt cam and maintain the ls2 timing chain any modifications that have to be done??

 

The cranks are the same, so in reality you have the proper crank. And from my own experience you need to have a billet 24x wheel tac'd to the crank. There are many threads about reluctor wheels moving, it's simple and inexpensive.


Here is an example : http://www.yellowbullet.com/forum/sh....php?t=1464306


No modifications to anything for timing chains.


I actually have a 408ci with Callies crank and rods, diamond pistons.
GMPP LS3 heads and the GMPP single plane intake.
LS7 lifters, C5R timing chain, stock cam gear and crank gear for the timing chain, and Katech oil pump.

 

I HAD A MISTAKE IN MY ORIGINAL POST SO THIS HAS BEEN CORRECTED.

If you have a 58x crank it is easy to add a 4x timing gear by just adding a LS2 timing cover and the later LS2 timing gear that is a 4x pattern. This assumes your engine management system can read a 58x crank and 4x cam gear.

Then you don't need to get anything redone. You just leave the old cam position sensor in the back of the engine as a plug.

Also note that the 58x crank and 24x crank sensors are different (the 24x crank reluctor is really two reluctors side by side) and the two sensors also operate at different voltages in the OEM system.