I've been taking notes over the years on the variations in 1963-1966 289 HiPo fan spacers and figured I better post my observations for discussion before I forget about it or lose the notes. All spacers are 2.36" in total length. The differences are based on four criteria:
A) Presence of either an engineering number or a "blank-out pad"
B) Dorman logo style (number present or not)
C) Location of Dorman logo relative to the engineering number or "blank-out" casting number pad
D) Weight which presumably is an indication of material differences (aluminum vs. magnesium alloy?)
I have seen the following 5 variations, photos are of variations 1-4.
1. C3OE engineering number, Dorman #(blank), number to right of logo, 5.10 oz,
2. Blank-out pad, Dorman #(blank), pad to right of logo, 5.00 oz
3. Blank-out pad, Dorman #1, pad to left of logo, 5.10 oz
4. Blank-out pad, Dorman #3, pad to left of logo, 7.80 oz
5. Blank-out pad, Dorman #4, pad to right of logo, weight unknown, (6S1757 original, on car)
Anyone with additional info on the variations or where they may fit into production sequence, if at all, please post. I assume there are more variations, like a Dorman logo with #2, but I haven't personally seen it. Also, anyone know why the engineering number would be blanked out?
Thanks,
Dave