Engine oil capacity

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1950fordwoodie

Junior Member
Joined
Nov 1, 2024
Posts
1
Reaction score
1
Location
Gold Canyon, AZ
First Name
Bart
Truck Year
1979
Truck Model
C1500
Engine Size
406
Hey group, need an answer to a stupid question. My son and I built a small block 400 for my 79 GMC C1500, had our machine shop run and pull it on their dyno. I just dumped the break in oil and refilled it with 5 quarts. I filled the new oil filter, just shy of a quart to get it full, then put the remaining 4+ quarts in the engine. Started it up, built pressure, checked for leaks etc. After sitting level for 15 minutes, I pulled the dipstick to see if it needs any additional to top it off and was surprised to see the dipstick showing over full by about an inch. (Probably around a quart.) I'm running the factory pan that was on the 400 when we pulled it from a 79 GMC K1500. I did have to rotate the factory upper dipstick tube forward 90 degrees to clear my headers, but I wouldn't see how that would make a noticeable difference on oil level. Been a while since I've owned a small block, but back in the day, around 5 quarts was pretty standard capacity for most of them that I remember. Anyway, does anyone have an engine oil capacity chart for 1979 1/2 ton models? I'm having no luck finding a reliable answer online so far. Just want to confirm how much it should hold so I can re-mark my dipstick. Thanks!
 

HotWheelsBurban

Full Access Member
Joined
Mar 31, 2023
Posts
2,350
Reaction score
5,506
Location
Houston, Texas
First Name
Carol
Truck Year
1990
Truck Model
R2500 Suburban
Engine Size
350
Hey group, need an answer to a stupid question. My son and I built a small block 400 for my 79 GMC C1500, had our machine shop run and pull it on their dyno. I just dumped the break in oil and refilled it with 5 quarts. I filled the new oil filter, just shy of a quart to get it full, then put the remaining 4+ quarts in the engine. Started it up, built pressure, checked for leaks etc. After sitting level for 15 minutes, I pulled the dipstick to see if it needs any additional to top it off and was surprised to see the dipstick showing over full by about an inch. (Probably around a quart.) I'm running the factory pan that was on the 400 when we pulled it from a 79 GMC K1500. I did have to rotate the factory upper dipstick tube forward 90 degrees to clear my headers, but I wouldn't see how that would make a noticeable difference on oil level. Been a while since I've owned a small block, but back in the day, around 5 quarts was pretty standard capacity for most of them that I remember. Anyway, does anyone have an engine oil capacity chart for 1979 1/2 ton models? I'm having no luck finding a reliable answer online so far. Just want to confirm how much it should hold so I can re-mark my dipstick. Thanks!
I think I read on here recently that there are 4 quart and 5 quart oil pans for small blocks in trucks?
Every 350 I've ever changed the oil in, held 5 quarts. Sometimes when I put 5 in though, I've gotten the results you got(even on two trucks I know have factory oil coolers because they have the HD towing package). And part of that 5 quarts, about 2/3 of a quart, is in the new oil filter when I install it, so there's clean fresh oil going into the pump.
 

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