temp difference from t-stat

I think the bypass is 3/4" NPT to 1" hose and the heater hose is 1/2" NPT to 5/8" hose. Take your plugs with you for comparison or look on this page...

http://www.summitracing.com/search?...cending&keyword=intake manifold hose fittings

Also noticed that your temp sender is in a reducer adapter. The heater hose will go into that hole and if you pull the plug just to the left of the temp sender, the sender will go into that hole with no adapter. Hope this helps...