Hi Fernando.
Here are pics. My engine is a 1958 GMC 270.
look behind the exhaust header you can see the valve. It is near the back of the engine on the driver side.
A close up . It looks like the one you have.
Ok rixtoys52.When I bought my truck in january 2005 I didn't have any manual to know which correct type of cylinder block drain cock for it.Bought with same as the image 783 type I withdraw it and put an used part same as the image 784 type(EARLY).This began to leak during two years.Yesterday I changed again 784 per 783.Now it does not leak and it is original for my truck that is LATE VEHICLE(02-44).
I have a question about seals.
New seals are much thinner than originals, for example in my transfer case the original is .650 and the new one is .375 . How do you install the new one so it sits the right depth and is in straight. Thanks for any ideas.
My engine is a 1958 GMC 270.
I thought there was only 270 engines in years 1941/45. ALWAYS use brass fittings there(Dr.Deuce)
The correct is use brass fittings between cylinder block and drain cock?? But the drain cock is already of brass. How do you install the new one so it sits the right depth and is in straight.
Months ago I still found two originals rear axle pinion seals.I think the important is the inner and outer diameters.
1941-1962 sort of. The later engines ~1950 I think had a different head and pistons to match. The "turbo-top" pistons of the 1941 engines gave way to the flat top in later years
BE CAREFUL
Dr Deuce Over 50,000 driven miles in a CCKW
1942 CCKW closed cab shopvan
1943 CCKW closed cab cargo w/M32 MG mount
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1945 CCKW open cab cargo w/artic cab
1942 Chev cargo
1942 Chev K51 Panel
1944 Chev M6 Bomb Truck
1942 GPW Jeep http://home.comcast.net/~cckw/wsb/html/ ... 59870.html
Thanks Dr deuce. I am still learning about the GMC engines. I just looked up the general years of production. Do you have a source that I can read to see the changes over the years of production?