O.K., If Throttle body coolant by-pass keeps throttle body cooler, would'nt blocking off the exhaust heat crossover that allows hot exhaust to flow through intake for "winter use" keep the entire intake set-up, runners, plenum, and all alot cooler. Has anyone tried this , and did you notice much SOTP difference? Of course, from the factory, they've got these things set-up to run hot as h*ll,(..195*t-stadt, fan on at 225* or more, etc..) but cooler should be better. I remember years back when using a Edelbrock intake and Holly carb, we would always use the blockout plates that came with the new intake gasket kits. This kept things cooler. Would this benefit a TPI set-up, would it be worth removing the intake to put a set of these in, or is it a waste of time unless you're tearing it apart anyway to put on a better intake, etc? Mines a 305 so the intake , and runners are stock, except for a ported plenum, and stock 48mm TB, with coolant by-pass. Comments? Thanks in advance.

 

When I had my TPI set up I had the EGR blocked off on the intake and I didnt really notice much of a different. When I ported the plenium I knocked the EGR walls down and noticed a slight increase.

 

If you block the EGR passages off you will not pass emissions. You are not going to notice much if any performance gains in doing this.

 

All it will do is slow down your intake heating up. Your intake will still get hot, it'll just take longer. You'll also have to reprogram your chip for the nonfunctioning egr.