This is pulled off another site but when the time comes I'm going to look into these radiators. I'm not sure if buicks inlets and outlets locations or angles.
You need to order a HD fan clutch for 1988 Suburban 454 and an aluminum radiator for 1989 Park Ave. These will bolt right in and should cost you around $250. Car will run 160 all day.
John has done this to both my 71 GSX and 69 GS. The 71 was running at about 200 and going as high as 220 in traffic, since the HD fan Clutch been installed it has been running at around 180. The 69 had it also done with the Park ave radiator and it never went over 165 on the way home.
The Park Ave core is 1-row and has a thickness of only 1".
Most aftermarket aluminum core units are 2 rows of 1" tubes (total thickness of 2+").
The visteon 709 or 840 (Chevy Blazer, P-van, etc.) is 1-row with 1-7/16" thick core. Should be about $130. Also Delco 20778.
http://www.v8buick.com/showthread.ph...r+Harold+Rolls