I did a search on here and google attempting to find what /6 I have in my 1963 D100. I came up with nothing. The door tag says it's rated at 127 hp, and the number cast on the block is 2463490-20. Any of you /6 geniuses out there know what displacement that is?

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1963 Dodge D100, SL6 and 3-on-the-tree.
1961 Dodge D200 Crew Cab, ex-USGOV, SL6 and NP435.

Stamped numbers on right(passenger)top-side of cyl head,above no.1 sparkplug should show CID.

Truck slants of that vintage should/would be pale yellow in color.
Try the link FYI.
http://slantsix.org/articles/parts-matrix/jpg.htm

Excellent info. Thank You! I check that out when I get home tonight.

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1963 Dodge D100, SL6 and 3-on-the-tree.
1961 Dodge D200 Crew Cab, ex-USGOV, SL6 and NP435.

I have an ex-forest service '63 swb utiline,minus the original slant.
A "98%" probability yours is 225 as 170 are /were few.
Also,FYI,straight axle truck slants should have a front-sump,
most cars a center-sump,
later trucks,(IFS) rear sump oilpan.

This is good for chassis and other truck specific info.

http://www.sweptline.org/forums/