I pulled this info from pontiac power racing:
http://www.pontiacpower.net/engcode01.html
YB B-body 65 389 256 Turbo 400 1x2 9778789 2 AC
So it's a 2bbl 389 for a full-sized `65. Had Air conditioning.
I can't find any info on that head casting number either. What other casting numbers are on them?
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Regards,
Henry
1989 Trans AM GTA
Brilliant Red with Dove Grey Interior
5.7 TPI/700R4 3.27 "Aussie" Rear
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1972 LeMans with Endura Option
Lucerne Blue with Black interior and Black Vinyl Top
400/TH350 (Sold)
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"Wind in my hair, shifting and drifting, mechanical music, adrenaline surge..."
-Rush, "Red Barchetta"
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