I have a Summit direct fit aluminum radiator in my 69 bird. It bolted up nicely and the temps have not gone over 190- even when breaking-in the new engine in August. I had to cut a hole in the factory shroud for the upper hose because the actual core is not as wide as the original rad- the brackets, however, lined up well and the unit comes with a trans cooler.
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Will Rivera
'69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
'69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress
‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here:
https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb
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