overheating issue and steam pipe using factory rad in 94 gmc z71 6.0/4l80e swap

[westofb]

Haven't yet finished my ls to 95 obs swap (work in progress). I was bound and determined to use the donor truck (01 Silverado) radiator and expansion tank so that it work as designed for the 01. Well after a week or two fighting it and trying every expansion tank I could find in salvage yards I gave up. I reused my 95 radiator, and after some research found a web site (jags that run) that makes an upper radiator hose adapter with provisions for a bleed valve and steam vent hook up. I have only been running truck in garage so far but seems to work very well at burping the system, only had to relocate upper hose so that it runs across the radiator shroud at a point lower than the filler neck of the 95 radiator. Opened the bleed valve and pour in coolant and voila, no air bubbles in system. Here is a link to the adapter I installed:

http://jagsthatrun.com/Pages/Parts_Cooling_LSI-tee.html

It costs $33 including shipping, they also have same set up with a built in sight glass for I think $58. Hopes this helps you out!