SB 400 with Tuned Port Injection. What temp should it run at?

[fitz]

My truck has a SB 400 with TPI. I've always been told he 400's should be run on the cool side because they are prone to overheating. On the otherhand most TPI motors are set up to run at 225-240 degrees. In my mind running at 225 degrees with a 400 just seems to hot. Are any of you running 400 motors? What temp's do they run at?

[bigkountry]

I have a punched out 400, cammed, all the goodies with a 180 stat. I did have the steam holes drilled out to help with the hot spots these engines are prone to get.

I have yet to see mine reach 190, in the summer, out playing in the mud.

This is on a carbed engine though, but I doubt the TPI would make a difference. Sounds liek you have a problem somewhere.

Hope this helps

[VileZambonie]

You should be using a chip for your tpi set up and running a 180° T-stat

[fitz]

  I think I've still got some sorting out to do on the TPI set up. The cooling system is pretty stout (4 core rad. with electric fan) and the truck will run at 180 all day long. The problem I'm having is that when I run it at 180 the S.E.S. light will come on and flash a code 33 (Mass Airflow Sensor). If I manipulate the fan switch on and off and let it run at about 210 the truck runs fine and no S.E.S
  This TPI set up has been in the truck about 6 years or so but has less than a few hundred miles on it since installed( truck was stored most of the time). It was installed using all new parts including a painless wiring harness and a Bosch MAF,all of the other sensors and injectors were purchased from GM.
  I have spare TPI set up so I'll try changing the MAF sensor and related relays this week. Just trying to find out if the temp and SES are just a coincidence or if they are actually related.
  As far as the chips go, anyone know of a place in New England that can burn custom chips(if thats what it turns out to need)?.