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Old 09-15-2022, 03:25 PM
bweible bweible is offline
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Default Help identifying Super Duty or not
Hi guys, my father in law passed away and I inherited a 1963 Pontiac 421 SD block (or what I was told). I don't have the background or knowledge to tell if it is legit. Would you mind looking at the pics and giving me your opinions? Appreciate it!
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Old 09-15-2022, 04:05 PM
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johnta1 johnta1 is offline
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Engine Code Search


Type 135U in the engine code section.
And yes that should be a SD block.



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Old 09-15-2022, 04:07 PM
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135U is the engine code for a 405hp 421SD engine, manual transmission, dual four barrel carbs.

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Old 09-15-2022, 05:20 PM
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jamesq jamesq is offline
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That's a pretty nice inheritance!

Congratulations, James Q

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Old 09-15-2022, 06:40 PM
tom s tom s is offline
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Looks like amply boss broke Ken off for the bell housing?

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Old 09-15-2022, 06:41 PM
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Hate spell correct!

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