Re: correct size 6 blade fan for 21" shroud
Shroud size doesn't matter for fan as long as it's a small block shroud. The opening is the same size and location regardless of 23" A/C radiator or 21" non-A/C radiator. '69 used 21" radiator for all small blocks, '68 used it for non-A/C or non-hd. Summit should give you the correct parts if you search by year. Mixing and matching years would be the only thing that might throw it off since they went to long water pump in '69.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled