hey guys im putting together the 6.0 with the 6.2 heads and a ls3 intake but the stock coolant crossover from the 6.0 is to tall the intake wont bolt down??? Are they blocked off on the ls3? or some slim design??

 

I have the exact same setup. 6.0L engine, 6.2L heads, FAST LS3 intake. You just have to bend the outlet barb a little.

ALL LS engines need a crossover in the front!!!

If you look close you can see it in this pic.

 

I just went ahead and bought an LS3 coolant crossover. They can be had for pretty cheap on eBay anyways.

 

Right on thanks ill see what i can doo!!! So u have the complete crossover or just the fron?t crossover?

 

It's just a front crossover on the LS3's. You need blockoffs for the rear.

 

Put a crossover in the rear too.

 

I have a crossover in front and block offs in the back.

LS engines just have crossovers in the front and block offs in the back. F-bodies had one that crossed over both and interconnected. They dont work with new intakes without modification to intake itself.

 

You can route the hoses individually. Your cooling requirements depend on how much power you're generating.

 

hey guys my LS3 heads came with the rears already blocked off is nobody elses like this? it just looks like a machined plug that is pressed in????

 

Blocked in the rear is correct

 

I used my old LS1 tubing and went with both the frt and back connected. This is the best way it helps eliminate steam pockets and hot spots in the rear of the heads.

 

GM stopped doing it years back. It couldnt have been that important to connect all 4. Sure you can do it and it may have some unmeasurable minimum benifit. But if GM Blocks off the rears on everything for the past 8 years or so, its just fine to do also.

Its all up to what you want to do at this point, as long as the front crossover is connected correctly.