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Anyone know what the differences are in these over the years? I need one for my 72 292 The parts store did not have a listing for 72, the earliest they had was 76. I got it yesterday, today I look in my LMC truck parts catalog and they list 67-74 as being the same part but 75-76
has a different part number.
1969 Chevrolet 3/4 ton 350/400
1972 GMC Jimmy 2wd 292/200-4R
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GM;
Not all 'Parts Suppliers' use the same #s.
If you take the one you want to replace to the store, they will match it etc.
Good luck, John M., #3370....
John M., I.I. #3370
"There are no shortcuts to any place worth going". -Anon
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This is a long block so I don't have an old one to compare it to. I looked in my GM parts book and it also lists 67-74 and 75-76
I am guessing it is just a different depth from the block to the end of the shaft.
1969 Chevrolet 3/4 ton 350/400
1972 GMC Jimmy 2wd 292/200-4R
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GM;
Good guess, that's probably it. The distance from radiator/fan etc.
Get the 'short' one first, (to check with) you can exchange it later if needed.
JM.....
John M., I.I. #3370
"There are no shortcuts to any place worth going". -Anon
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The 292 is different from the 250. It has one or two more hose connections.
I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.
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Major Contributor
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The difference could also be the bolt pattern for the fan blade and pulleys. The V-8 family did this change in 1969. You might be able to get by using the later pulleys and blade.
Ontario Inliners
1965 Chevelle
1940 Chev
1965 Chev Pick-up
1970 MGB Roadster
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Hello all-
I'm not a new member, just been in "automotive hibernation" for a while...
I've revived this old thread because I'm looking at water pumps for my 292 now. If I remember right, the earlier motors had a bypass hose that went from the pump to below the thermostat housing, presumably to allow coolant circulation within the block and head until the thermostat opens. Any opinions on this? Is it worthwhile? Are there any other differences between a 250 and a 292 pump, impeller size or flow rate?
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A bypass hose is a good thing to have on an inline 6. Because of the location of the water pump, #1 cylinder tends to run too cool and #6 tends to run too hot. Allowing circulation through the block even when the thermostat is closed helps to alleviate this, and keeps #1 from wearing out as fast.
Also, with a 261 a bypass hose is necessary to prevent steam pockets under cold start loads, due to the siamesed cylinders.
Chevrolet put bypass thermostats on for a reason, they would not have gone through the expense if they had not deemed them necessary.
I've also heard the the 292 pump has a baffle on it that the 250 pump does not, to help with the #1 cylinder cooling issue.
1950 Chevy pickup with '62 261, 4 speed.
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