How many depressions on the sides? The 63 Judging Manual states 2 on each side. If this is the case, when did GM start using the pan with 2 on one side and 3 on the other?
Thanks, Bob
Thanks, Bob
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Re: 63 6 qt. oil pan?
Bob-----
There were three different "6 quart oil pans". The first was GM #3820001. This oil pan was used for 63-65 with mechanical lifters, POSSIBLY some 66-67 L-79s without p/s, some or all 70 LT-1s, and all 70 ZR-1. I believe that this is the pan that has the "two depressions" on each side.
For "later" 1970, the "6 quart" oil pan was changed to GM #3956670 and this pan was used for some or all "later" 1970-1971 LT-1 and all 71-72 ZR-1. I'm not sure as to when the changeover took place in the 1970 model year; in fact, it may have been VERY early in the model year. I believe that this pan had "two depressions" on one side and "three depressions" on the other. Otherwise, it was similar to the earlier 3820001 oil pan. I'm sure that there were other subtle differences (since I doubt that GM changed the pan just to add one reinforcing "depression" on one side), but I don't know what they are. In late 1970 the 3956670 oil pan replaced the GM #3820001 oil pan to SERVICE all earlier applciations.
In 1978, the GM #3956670 oil pan was discontinued from SERVICE and replaced by GM #359942 to service all 1963-72 Corvette applications using the "6 quart" oil pan. The GM #359942 was a SERVICE-only oil pan; it was never installed on a PRODUCTION vehicle. This oil pan has "two depressions" on one side and "3 depressions" on the other. In addition, it uses the 1975+ small block oil pan front pan seal configuration. This configuration utilizes a .41" thick front oil pan seal in contrast to the earlier .22" thick seal, for the purpose of improved sealing.
I think that's pretty much the "6 quart" oil pan story for 63+ Corvettes.In Appreciation of John Hinckley -
Re: 63 6 qt. oil pan?
The original oil pan on my '63 SHP engine has two identations on the right and three on the left. On the LH side, the rear depression is behind the oil filter housing and the center depression is at or just ahead of the forward end of the oil filter housing.
DukeComment
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Re: 63 6 qt. oil pan?
The service replacement oil pan for C1 applications has been undergoing a constant change in configuration over the past 10 years. The number of depressions on each side as well as their locations are not absolute or consistant. Also, I have noticed slight variations in production pans. (both solid lifter and hydraulic lifter versions) I wonder if these early production pans were multiple sourced?
Varooom!Comment
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Re: 63 6 qt. oil pan?
A special thanks to Joe,Duke and Dale for your input and help.
Thanks Again, BobComment
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Follow-Up
Based upon some information which I received from Terry McMannmon, I'd like to provide some correction and/or additional information.
Apparently, the situation with 70 LT-1 oil pans was not completely as I described. The "some" 70 LT-1s that I mentioned that were equipped with "6 quart" oil pans was limited to pre-May 1970 built LT-1s. After that time, except for the LT-1 engines supplied with the 53, or so, ZR-1 cars manufactured during 70-72, LT-1-equipped cars used the "5 quart" oil pan, GM #3820000.
This would also mean that the GM #3956670 "6 quart" oil pan was used only on later build 1970 ZR-1s, all 71-72 ZR-1s, and for "6 quart" oil pan SERVICE requirements until 1978.
I also want to correct another bit of information which I provided which could easily be misunderstood. Specifically, when I said that the GM #3820001 oil pan was the oil pan that I believe had the "2 indentions" on each side, I should have said that IF there was a 6 quart oil pan that has only "2 indentions" on each side, that pan would be the 3820001. I'm fairly certain that the 3956670 and completely certain that the 359942 pans have "2 indentions" on one side and "3 indentions" on the other.In Appreciation of John HinckleyComment
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