Originally Posted by F-BIRD'88
If you need the heater it goes in this water circuit.
Top of water pump to heater, from heater core to drivers side rear manifold port. ( that you would have to add to your manifold.)
Many of the old factory GM manifolds (eg 64-65 corvette 327-375hp fuelie injection manifold) had this rear water port.
(GM eliminated this rear water port on the manifold during the "emissions era" as they wanted a hot(er) running motor at the time.
Many of the edelbrock and professional product manifolds have these rear water ports.
Makes a big difference in idle cooling stability on my 400sbc.
(No more thermostat /temp gauge hunting during warm up.)
more stable/ consistant overall cooling while idling and driving.
Yeah I might just give it a go. Although I am running a 160 degree thermostat with two 5mm holes drilled in it, an electric water pump, a 16" electric fan and a decent size alloy raidiator and to date have had no heating problems. It sits between 160 and 180 most of the time and snuck up to 200 in heavy traffic and hot weather. Not bad for a decent cam/compression fresh engine i reckon.