I'm not much up on radiators in our GMC's. Never really paid much attention=
. Keep an eye on the inside with my inspection camera. Change the antifreez=
e every 2 year. Never longer. The stock original one that's 40 years old ha=
s worked fine. Even in Lake Havasu City Az. In July at 110 degrees with th=
e A/C on in 2008. I pull heavier loads with our 78 - 403. Then about anyone=
that I know. Pulling Linda's handicap lift van. A Chevy Uplander that put=
s my GVW at 17,000 LBS. When towing my enclosed 24 ft trailer. With a car i=
n it. My GVW is at 24 to 26,000 LBS. That's more then double the weight of =
GM completed coaches. I have absolutely no extra engine venting of any kind=
. A record original is about $550. A new aluminum is about $750. So. What a=
re you getting for the extra $200. I've had more corrosion problems with al=
uminum, then brass that the original radiators are made of. Aluminum transf=
ers heat very well. But brass must be very close. I don't know the BTU tra=
nsfer numbers. Bob Dunahugh 78 Royale
. Keep an eye on the inside with my inspection camera. Change the antifreez=
e every 2 year. Never longer. The stock original one that's 40 years old ha=
s worked fine. Even in Lake Havasu City Az. In July at 110 degrees with th=
e A/C on in 2008. I pull heavier loads with our 78 - 403. Then about anyone=
that I know. Pulling Linda's handicap lift van. A Chevy Uplander that put=
s my GVW at 17,000 LBS. When towing my enclosed 24 ft trailer. With a car i=
n it. My GVW is at 24 to 26,000 LBS. That's more then double the weight of =
GM completed coaches. I have absolutely no extra engine venting of any kind=
. A record original is about $550. A new aluminum is about $750. So. What a=
re you getting for the extra $200. I've had more corrosion problems with al=
uminum, then brass that the original radiators are made of. Aluminum transf=
ers heat very well. But brass must be very close. I don't know the BTU tra=
nsfer numbers. Bob Dunahugh 78 Royale
