Capping the coolant line to plenum

[1991 Corvette ZR-1]

Curious as to methods used by forum members for capping or plugging the coolant line which runs along the intake plenum in the passenger side and f the engine. I am having my injector housings tapped and plugged so no more coolant through the plenum. I would like to keep all lines in place for the factory appearance. I am wondering if someone has already done this. What I had in mind was say a piece of 3/8 aluminum dowel rod pressed into the coolant hose coming off the surge tank with several hose clamps on that portion of hose to create the plug. I would have this rod pressed into the hose far enough that I could still fit the hose to the hard line off the plenum to secure.

If someone has done this, I would like to hear the details or pictures.

[efnfast]

I capped mine with pipe plugs, no factory hoses. Marc does not recommend making the plenum coolant free.

[Paul Workman]

For clarification? Are you referring to capping off the coolant to the throttle body, or are you talking about something else? Like Steve, (and dozens of others) a 3/8" pipe plug - drilled and tapped into the injector housing coolant port leading to the pipe (driver's side) that goes to the throttle body, is a common mod. It prevents the TB from heating the air which results (theoretically) in denser air/more power. AND, you don't have to drain the coolant before removing the plenum - which simplifies the whole coolant juggling routine to ZERO fussing.

Note: FWIW...I've had mine plugged for 12 years now and have NEVER had any regrets.

[1991 Corvette ZR-1]

For clarification? Are you referring to capping off the coolant to the throttle body, or are you talking about something else? Like Steve, (and dozens of others) a 3/8" pipe plug - drilled and tapped into the injector housing coolant port leading to the pipe (driver's side) that goes to the throttle body, is a common mod. It prevents the TB from heating the air which results (theoretically) in denser air/more power. AND, you don't have to drain the coolant before removing the plenum - which simplifies the whole coolant juggling routine to ZERO fussing.

Note: FWIW...I've had mine plugged for 12 years now and have NEVER had any regrets.

Hi Paul. Funny you bump this thread as I just got back from a test drive with everything buttoned back up. I sent my top end to Pete for porting and he plugged the injector housings as well. I ended up using a 3/8 piece of aluminum dowel rod cut down to about two inches. Then I pushed it into the coolant hose that would be attaching to the plenum hard line and used a smooth hose clamp over it. Also, for extra piece of mind, I had the aluminum hard line that the hose attached to filled with aluminum by a local welder. I routed all the hoses like everything is factory.