[jmink427]

BBC seems to get hot when just cruising, but cools down really fast when you kick it in to neutral. Even cools down when at idle. Could I be moving the water to fast through the radiator?

Pulleys are 1:1 ratio. 160 thermostat aluminum radiator. 2 1" rows 25" X 19" core size. Two 12" electric fans W/shroud (pullers) No bypass hose on top of the water pump (GM aluminum pump), but have drill a 3/16" hole in thermostat for circulation when cool.

427 11.75 to 1, 049 heads.

 

[Chukky]

Sounds lean / Timing wrong .

 

[Shelton_Barrs]

How many RPMs are you turning at cruise speed? Lean and timing could be issues so they should be checked like Chukky suggested but it is possible with 1:1 on the water pump you are moving the water to fast. I would look to slow it down some and see what happens.

 

[Nosman]

I would verify that the fans are actually pulling. While you're moving, the air may be stalling in the rad, but then when you are sitting still, it doesn't care about fan direction it'll still blow throught the rad. They may be wired wrong.

 

[jmink427]

How many RPMs are you turning at cruise speed? Lean and timing could be issues so they should be checked like Chukky suggested but it is possible with 1:1 on the water pump you are moving the water to fast. I would look to slow it down some and see what happens.

I have another post about fuel ratio and everybody is telling me the car is fat. Thats why I was looking into a water flow issue. Thanks.

 

[TOPLESS63]

gold restrictor

 

[Chukky]

The water pump pulley should be overdriven at idle speed, ie 40% is nice, when the car gets up to speed the airflow will take care of cooling.
Moving the water "too fast" means a too big a radiator usually.
For water to lose its heat load it has to be agitated/shaken/shocked and dropped - just like your significant other .