Hey guys, going to head out to buy a block heater in the morning since I just moved to a much much colder climate, but I was unsure if the inner diameter of the B16A SIR-2 engine were (swapped into a 97 Civic with an AT half width radiator). It's been so long since the swap was done I just can't for the life of me remember what the ID of the hoses were. The heater was looking at comes in 1", 1.25" , 1.5" and 1.75" sizes and goes on the lower rad hose. Any help would be great.
Thanks!

 

I forget the ID, but a del sol VTEC radiator would suit your needs quite nicely .... it did for my b-swap

EDIT - 1.25"

 

There is no difference between the delsol vtec and automatic d16y8 radiator other than the ATF bypass at the bottom, but thanks for the measurement, thats what I thought it was.

 

Does the AT civic have bigger in/out? My manual Y7 had a 1-1/8" in/out.

 

Not sure if the in/out is any bigger since i didnt measure, but I have B16 rad hoses clamped on there just fine and the AT rad is definitely thicker than the 5spd one.

The car was originally an auto, hence why that rad is in there.