Replacing radiator in car - appears to be non original.
1969 cutlass S, 350, auto, A/C.
Ive always noticed poor fit on radiator lower hose. With recent engine work, I’m replacing radiator. Current outlet is 1 1/2, but when I order new hose it appears to be 1 3/4, I’ve been looking at replacement radiators and noticed some have 1 1/2, some 1 3/4 outlet. Was larger outlet used on a/c or performance cars?
thanks

 

The 1970-older cars used a 1.75" lower radiator outlet and a 2" water pump inlet. The 1971-up cars use a 1.5" radiator outlet and a 1.75" water pump inlet. The lower radiator hoses are different as a result. If your 69 has a 1.5" lower radiator outlet, it's not the original radiator. Many vendors only stock the later style radiators with the 1.5" port and require use of a rubber bushing to fit the hose on the older cars. The real question is, what water pump do you have, 1.75" or 2"? If you have a 1.75" water pump and a 1.5" radiator, use the lower hose for a 1971-72 car. If you have a 2" water pump and a 1.5" radiator, use the lower hose for a 1969 car and get the bushing to adapt the larger hose to the smaller radiator.

https://allstarperformance.com/radia...-1-5-all30240/

 

Thanks that helps a ton

 

If you don't care about originality make the swap to the 1971 and up setup. The later lower radiator hose fits better as it doesn't hit the pitman arm/frame. As Joe mentions if you do this you'll have to change to the correct water pump, lower radiator hose and correct radiator.


1971 & up lower radiator setup on a 1970.

 

Since his current radiator has a 1.5" outlet, he already has the 1971-up radiator. I'm willing to bet that his water pump already has the 1.75" inlet port.

 

And we haven't even started talking about water pump height or pulleys yet!

 

Since that apparently isn't a problem for him. The question was about outlet diameter.

 

All good
I have old style pump and ordered correct radiator
thanks for help