I would like for you guys to check my specs on my 6.0L build in my 2013 GMC truck. I plan on using a stock LQ4 bottom in with the 243 heads plus use the stock LQ4 intake manifold and a 90mm TB. The heads will be hand ported plus milled .030 or .035 because im shooting for around 11.2:1 to 11.5:1 comp with a MLS gasket. while the heads are getting a valve job they will also be getting bigger valves because one of the stock intake valves looks bad off. i will check for pushrod length just to make sure i order the right size. This is the cam i plan on using JEGS Performance Products 200582 JEGS Hydraulic Roller Cams - Free Shipping on All Orders @ JEGS with PRC dual spring kit and stock rocker arms. The piston to valve will also be checked to make sure im not getting to close. im sure i left something out but am i off to a good start?

This is the truck, LQ4 and 243 heads as i know everybody loves pics

 

After some research and using the Summit Racing Compression Calculator i put in the stock specs of the LQ4 ( which i think there right ) with a .051'' gasket thinkness and came up with 9.55:1. These are the numbers i put, Bore 4.0007, Stroke 3.622, Cylinder Head Volume 71.06'', Effective Dome Volume 6.7, Deck Clearance -.005 and Compressed Gasket Thickness .051''. So by changing the heads from 317 to 243 ( 64cc ) it comes out to 10.3:1 before milling the heads. So milling the heads to 58cc would give me 11.05:1 right where i want to be.

Is all this right cuz my head sure does hurt hehe????????????

 

You do know about the difference in knock sensor locations, reluctor wheels, etc in the Gen IV vs Gen III, right?

 

Yes sir i do... I have a LQ4 which is Gen III im putting in my truck.

 

Are you changing the crank for the 54x reluctor so it will work?

 

No sir the bottom end will stay stock. i have the computer, wire harness, motor mounts, intake exhaust ect ect from a 03 2500 truck. The only thing i was going to change out was the heads, cam and TB. Is there something im missing if so please tell me so i can look into it more. Thanks

 

Yah good luck with that. You need to change the reluctor wheel out in order to get that motor to run in your truck, along with relocating the knock sensors to the side of the block. I'm not sure you've done your research on this swap. Or are you planning to swap wiring harness/computers out? Then idk how you will get the ECM to talk to the BCM. Goodluck

 

If i change the harness and computer out it still wont work? So it would be best to find an older truck like a 03-05 to put this in?

 

99-07 nbs have the 24 reluctor wheel. all the newer 07+ have 54 reluctor wheel it will work in and older truck but not yours unless you plan on swapping out cranks but you might as well get an ly6 and have a plug and play engine that you still could use the heads on

 

Ok thanks for the heads up. I thought if i used the harness and computer from the LQ4 it would work in my nnbs. Again thanks