I have been tring to lower the IATs on my KB for years. I've installed extra temp sensors for testing, installed a large heat exchanger and a higher volume pump, opened up induction to reduce pumping losses, etc. I still get absurd temp rise in boost. There is lots of discussion thruout various threads on this board but here is one thread that gets into what I believe is the root cause, the actual intercooler in the manifold.
https://www.performancetrucks.net/fo...ection-540049/

There is also some discussion in my build thread...
https://www.performancetrucks.net/fo...ebuild-522509/

Currently with the large hex and higher flowing pump, cruising IATs run 10-20 degrees above ambient but climb dramatically when in boost.

 

Hi, BigKID I read your build thread, I'll try the larger heat ex-changer.That spacer looks interesting . I saw your truck on you tube,looks good. Its awesome your on this site as well. What type of power you making now? I am at 500 at the wheels but the temps were around 70 degrees when it was on the dyno.

 

I didn't see any measurable performance gains from the phenolic spacer and have since removed it after seeing some scuffing on the rotors.
I haven't had it on a dyno but I speculate mid-600whp based on track times.

 

Alright, I wont consider the spacer. But with your permission, will copy your heat ex-changer blue prints.