Vintage Air Heater fittings,

[snappytravis]

I need somebody to line me out on the va gen IV heater fittings, They are both the same size on the heater core. I have 3/4 and 5/8 heater hoses off the ls3 waterpump. What is the best way to attach to heater core and also on the water pump, or do I just buy the hose that is 3/4 and reduces to 5/8 from vintage air? Does it matter what line goes to what port on water pump and heater core?
Thanks

[Schwartz Performance]

The rear port on the WP is feed to heater core.

To attach, hose clamps- either worm or gates heat shrink clamps.

Gates makes a lot of different lengths with 3/4 on one end and 5/8 on the other. Scroll down a little bit here: http://www.rockauto.com/dbphp/x,mfrn...ater_Hose.html

[snappytravis]

Thanks Jeff,,
I see they offer a 60" 5/8x3/4 I will have to order it up, I saw some of your cars at the Carcraft Summer Nationals. Work looks great, Black Chevelle was my favorite.

[parsonsj]

I pull the factory heater sleeves out of the water pump and run an NPT tap into the holes. They are perfectly sized for 3/8 and 1/2 NPT taps, and V/A sells NPT-to-A/C adapters so you can use A/C hose and hose ends.

[dontlifttoshift]

^^^That works too. Now VinAir just needs a heater control valve with 1/2" nipples so we can run the EZ clip hose right to it.

[rocketrod]

Another option is to use AN fittings on the heater hose, which alows you to use regular heater hose that you can secure with Gates Power Grip clamps then use a regular hose clamp to secure it to the heater control valve.