LS1 Coolant Cross over
 

I am in need of a LS1 coolant cross over tube. I need the 4 corner type.

Four corner type?

Typically there is one one the front connection the left and right heads. The rear ports each have individual plugs.

There are also quiet a few varients on the front with the outlet being in different locations.

So, what that in mind what do you need, I have a few laying about.

my 98 LS1 came with the 4 corner steam vent tubing

Yea, but that was the oddball year with the perimeter bolt heads. All later LS1 engines had the other arrangement.. at least by my rusty memory. lol

Cross over
 

I have a LS6 crate engine and I was thinking I would tie the front and rear together because of the intake style. See the picture below. I thought there might be a cooling advantage in doing so. What are your thoughts?

It certainly couldn't hurt and would be fairly easy with that manifold.

If I were you I would get two crossovers connect them via a small braided line. It's fairly easy to have someone weld a coupld of 4AN fittings on them.

That said GM didn't seem to think it was worth the effort to plumb them rear of the heads together, in fact on newer LS stuff the holes in the back come plugged (making left and right heads now).

I run my steam crossover directly into my water pump rather than running it to my radiator. Looks cleaner