454, 1987, lower oil dipstick Bolt

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Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
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Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Bolt at the block is missing, and haven't figured out.
Google AI says 1/2" - 13, but no.
The power steering Bolt on front of water pump is that size.
Definitely seems 1/2", but finer thread.
Could be 1/2" - 14 npt, but that is pipe thread?
1/2" - 20? Seems to fine, but clearly I don't know.
Can't hurt to ask men. One damd Bolt.
 

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