Trying to cap the larger port on the intake manifold and need to know what size rubber cap to purchase for it. Anyone have any idea as to the size?

 

I'd hate to suggest a ruler to help you out for this.

 

^ thanks I guess I could measure the hose aswell. My biggest issue is finding a parts store that may carry one.

 

The largest I have seen online from summit is 3/8" and that looks to be a close/tight fit.

 

go to napa auto parts or autozone, or pep boys. they sell a variety pack with numerous ones that will fit. for very cheap too. I think its 3/8 though. the variety pack is nice because you will end up using the others, its nice to have them. I got rid of a lot of clutter in my bay just by plugging off unnecessary coolant and vac. lines

 

thats what i did when caping off a bunch of vacuum lines.

 

I got the variety pack as well. worked like a charm... now that the mani is off to be taped for water/meth nozzles I removed all the vac nipples and drilled taped the holes they were in to 1/8 NPT the put port plugs in them. that way if I ever need to run a hose I can get a NPT to AN adapter and thread it in... voila!

 

Well sweet. I was hoping I wouldn't have to place another order with summit this winter.

 

if i my ask, wich ones are you capping off?

 

The large one the most forward on the manifold that points toward the valve cover. May be capping 2 if my catch can gets here in time. If it gets here I will vent the valve cover through that instead of through the KV back into the manifold.