Where did you find a 5/8 inch vacuum cap?

[landstuhltaylor]

I'm trying to finish up with all the details from my header swap and this is really all I have left. Everywhere I go the biggest size they have is 3/8. I need one that is 5/8 for the outlet on the driver side of the intake manifold.

[santa_rosa_lt1]

might want to check some diesel shops. or just remove the fitting and plug it?

[BrianEsser]

Most parts stores have them. Though they are marked as "Waterpump bypass block off plugs".

[SnakeOiler]

The only thing I can think of that big is the brake booster vacuum. Are you wanting to plug that?

[landstuhltaylor]

I don't know why I wrote what I did. I meant the air intake tube.

[Biggin'89]

Dorman/Help makes a multi pack of larger vac. caps but call them radiator bypass caps.