1991 Mitsubishi Galant VR-4
FIAV and ISC Blockoff

I blocked off the FIAV and ISC since I no longer have AC and the throttle body coolant lines. The plate is just 1/8" 6061 aluminum. The bolts I used are m5x0.8, 10mm length, allen head bolts. Have fun removing the old screws. I broke screwdriver bit on one of them and had to slot 3 out of 5 even after soaking them in PB Blaster several times. So far so good on after the install. Zero idle surge. Idles pretty decent with HKS 272/272 cams. Have to crack the throttle a bit during warm up but it's not a problem so far. Still easy to start.

Lower Throttle Body Removed:

Broken Screws:

Blockoff Plate Installed:

Blockoff Plate Powdercoated: