I concur.

Hans, will this be repaired before WCBF? We don't have the time or resources to do a motor swap at the meet.

im gona keep an eye on my rad at the ONBF

so which options do I have for direct bolt on? I'm thninking I'm going to replace the rad before I switch to a trans cooler to see what effect it has on the car.

Oil color is fine, I've never had an oil anaylysis but I know it does not burn any oil whatsoever.

In regards to oil pressure, I know the gauge is off by roughly 5-10 PSI, and at the extreme fluid destorying temps this thing got to, pressure is obviously going to drop as the oil becomes thinner. I'm also running full synthetic in the car so it tends to be on the low end.

also yes, the car does idle at -6.5PSI at 9000 feet boost gauge wise. at 3000ft I'm at -9.5PSI.

the engine has very good compression within 5% or so, tested a month ago:

Cylinder 1 158
Cylinder 2 152
Cylinder 3 161
Cylinder 4 154
Cylinder 5 148
Cylinder 6 154

I plan on running the h*** out of the car (getting it 220+) with a mechanical gauge to see what the actual number is.

In the meanwhile I need to know what radiator will bolt on directly without modification and will have a larger core (what year/car range should I be looking at?)

I also may swap the engine as a preventative step (like I did to the trans) when funds become available. It has a lot of miles and I'd love a low mile buick engine in the thing that has been grandma'd.

Look up some online sites like radiatorexpress.com and find the sizing of your radiator. Then look up early 90'* caddy'*. I forget which..look for the 4.9'*.

Then compare the sizing of the radiators. IIRC ours are around 30x17x?? thickness.

The syn oil should maintain better consistency..not run thinner.

Hop to it on that mechanical gauge and prove your dash wrong. I'm all for seeing that and stop letting it run so hot. Pull over and let it rest. It'* not worth blowing up.

I tried a 92 and a 95 Caddie radiator from the 4.9 deville. both had a 1" thick core, which is the same as my SSEi, same as the replacment for the SSEi. 30x17 are the dimensions. Napa showed no other radiators available for the deville with the 4.9. Perhaps its a napa thing and they are not made as thick as other (aftermarket) radiators.

The 4.9 rad had the oil cooler lines as well.

Napa Price out the door for the direct replacment radiator is $205. Radiator Express is not an option for me considering my location


I'm 90% sure my 98 has a 1" thick radiator from the factory, I did not measure it but looked at it briefly, I will measure when I get home. it looked like 1" but may be skinnier.

If there continues to be cooling problems, I guess I'll need to go to a trans cooler.

No, actually, its a 1 5/8" core for a 1993 Cadillac Deville Touring with the 4.9L V8

30 1/2" x 17 x 1 5/8" Little bit thicker than the bonne'* 1"

http://www.radiatorexpress.com/produ...aia_id=1025761

And the one for the caddy WITH the coolant sensor appears to be 1 3/8" thick, instead of the 1 5/8" without the level sensor.

nope its both the 1 5/8 and 1 3/8 versions on that site are only 1" thick at napa.....