Wow, I thought I was the only one with a 48 Plymouth with an Olds 350 motor. I had the original radiator recored with a high efficiency core, but I haven't run it yet. The tanks won't let it hold a lot of pressure, the guy that did it said I had to use a 7 psi cap.
Try again ? I have 350 olds in it right now but will have 455 olds in the spring. so will need a better radiator. THANKS
Might not be very helpfull, but my 48 came with a '73 Cutlass front clip & 455. Possibly the radiator is from the donor car, 25" wide & 22" tall.
Just use the stock 48 Plymouth radiator. It will do the job better than the rad that came in the car your motor is from.
Tons of aftermarket radiators out there that work better than the stock ones. Just measure the area you have to work with and find the ones that will fit. I use an AFCO which works great.
Why would you say that? Have you ever tried runmimg a V8 behind that particular radiator? As a matter of fact, for quite some time I used those Plymouth radiators as the preferred choice in various engine swaps. They have a good fin design and do a good job of transferring heat. Most aftermarket parts are designed to separate a person from their money. Unless you need the bling factor, that stock rad is the way to go.
I don't know about your switch to the big block, but I run a 350 with a re-cored stock 38 Mopar radiator. It works ok with a 4lb cap. Been running it 2 years now.
The stock radiator was more expensive. I paid $240.00 for my AFCO and it works better. Do your homework. AND yes I run a V8 (400 small block)
I used the original mopar radiator in my 48 Dodge. had a new filler neck installed and running a 4lb cap. Running a 318.
Different car, same story. I have a 40 dodge with a 360 and eneded up recoring the stock. I run a 4-5 pound cap and have never had any problems. Not many folks are recoring these days and it tends to get expensive and good quality can be hard to find. If I had it to do over again, I would just buy a custom from Walker, US Radiator or Griffin.