Thanks all - the NPT fittings screw all the way in and bottom out on the flare. Permatex makes an RTV specifically for sealing transmissions and supposed to withstand trans fluid. I may use that as my last effort and then move onto a new aluminum radiator.
OPH - it is a 3 core - my concern with the aftermarket radiators is adapting the shroud to them - online specs seem all over the place.
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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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