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Old 01-05-2011, 08:21 AM   #1
bkeese
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Default 62 FI oil pan?

OK after years of collecting the parts, I am finally assembling my 340/FI engine but the oil pan has created questions. The pan I have has the trays inside but the area around the drain is domed if the pan is upside down. The NCRS book I believe says flat. Is this an older pan and not correct for 62? Does anyone have a picture of the correct pan? Any idea what I have?

Thanks,
Bob
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Old 01-05-2011, 08:40 AM   #2
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Quote:
Originally Posted by bkeese View Post
OK after years of collecting the parts, I am finally assembling my 340/FI engine but the oil pan has created questions. The pan I have has the trays inside but the area around the drain is domed if the pan is upside down. The NCRS book I believe says flat. Is this an older pan and not correct for 62? Does anyone have a picture of the correct pan? Any idea what I have?

Thanks,
Bob
First of all, pictures would help us understand much better what you have (you know, the old saying, a picture is worth 1000 words).
The pictures below are for the SERVICE REPLACEMENT pan for 57-62 Corvettes with hi-perf solid lifter engines (which is what your 62 FI pan should resemble). Also shown is the FLAT windage tray that was used with these engines/pan.
Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

And while we're on the subject of FI pans, here's the long sump pan that was on 63-later hi-perf/FI engines. It also used the flat windage tray. As can be seen compared to a stock pan, the sump isn't quite as deep.
Click the image to open in full size.

Click the image to open in full size.

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The oil pump pickup on the left, with the longer tube, is required for the long sump pan.
Click the image to open in full size.

And this is the curved windage tray that was used on the original Z28 302 engines and later hi-perf Corvette engines.
Click the image to open in full size.

You can see that the curved tray fits nicely down in the 57-62 style pan. I also use this curved tray on stock pans such as the stock pan on the SB400 in my 70 Chevelle.
Click the image to open in full size.

Here's the curved tray installed on a Small Block. The flat tray installation is similar.
Click the image to open in full size.

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Last edited by DZAUTO; 01-05-2011 at 09:24 AM.
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Old 01-05-2011, 09:56 AM   #3
Viking427
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Originally Posted by bkeese View Post
OK after years of collecting the parts, I am finally assembling my 340/FI engine but the oil pan has created questions. The pan I have has the trays inside but the area around the drain is domed if the pan is upside down. The NCRS book I believe says flat. Is this an older pan and not correct for 62? Does anyone have a picture of the correct pan? Any idea what I have?
Thanks, Bob

Here's a pic of an original that Roy posted sometime back. Very similar to Tom's (early 70's) service replacement pan above, except it is in fact flat around the drain plug. Yes your pan should have the side baffles and trap door also shown in Tom's service pan above. Sharp eyed & knowledgable guys can identify correct high horse (solid lifter) C1 pans with the internal trap door & baffles just by the spot welds on the outside - it made spotting them in flea markets and junk yards much easier back in the day when they could still be found at both.


Click the image to open in full size.


..and you should know this topic of what is "correct and original" for C1 oil pans is probably one the most, if not thee most confusing topics to ever surface for C1 restorers, even among the "experts", as these threads show;
http://www.ncrs.org/forums/showthrea...69761&uid=3359
http://www.ncrs.org/forums/showpost....unt=5&uid=3793


I suppose your next question will be for a pic of an original rear stepped solid lifter harmonic balancer

Last edited by Viking427; 01-05-2011 at 11:31 AM.
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Old 01-13-2011, 01:58 PM   #4
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This is all incredible information, but, could one of you guys tell me which one would be correct for a 1961 315hp FI? How 'bout for a 1962 360hp FI?
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Old 01-13-2011, 02:09 PM   #5
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TOM!
Your a great person for info ,one of few , love reading any post you do.
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Old 01-13-2011, 03:01 PM   #6
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This is all incredible information, but, could one of you guys tell me which one would be correct for a 1961 315hp FI? How 'bout for a 1962 360hp FI?
Again, no "experts" ..only various levels of "qualified" opinions. IMO, you can be fairly confident the breakdown of those two GM part numbers by JL is correct;

GM #3769761---used for 1960-61 with SHP---has trap door
GM #3789629----used for all 1962 and all 1957-61 SERVICE---has trap door
GM #359937----SERVICE replacement for 3789629; has trap door and uses the 75+ style 0.41" thick front oil pan gasket instead of the 0.22" thick used for all of the above pans

An opinion supported by the description & pics of Tom's bare metal 62 pan shown above. This pan was (reported) to be both installed on all 62 Corvettes on the PRODUCTION assembly line and offered across the counter as the SERVICE replacement pan for all earlier 57-61 Corvettes. Its my opinion this same pan continued to be offered across the counter as the official service replacement pan for all 57-62 Corvettes right up through 1974 when they transitioned over to the newer style 57-62 service pan (p/n 359937) with the thicker front seal.

As for pics of an original SHP (solid lifter) 3769761 pan, someone else will have to verify if Roy's orange pan above fits the bill or not. There's evidence to suggest the trap door feature (not to be confused with the two side baffles) for the SHP motors didn't actually appear until 1960. Sure would've been nice if GM just stamped the p/n's in all of them
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Old 01-13-2011, 03:10 PM   #7
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Quote:
Originally Posted by Viking427 View Post
Again, no "experts" ..only various levels of "qualified" opinions. IMO, you can be fairly confident the breakdown of those two GM part numbers by JL is correct;

GM #3769761---used for 1960-61 with SHP---has trap door
GM #3789629----used for all 1962 and all 1957-61 SERVICE---has trap door
GM #359937----SERVICE replacement for 3789629; has trap door and uses the 75+ style 0.41" thick front oil pan gasket instead of the 0.22" thick used for all of the above pans

An opinion supported by the description & pics of Tom's bare metal 62 pan shown above. This pan was (reported) to be both installed on all 62 Corvettes on the PRODUCTION assembly line and offered across the counter as the SERVICE replacement pan for all earlier 57-61 Corvettes. Its my opinion this same pan continued to be offered across the counter as the official service replacement pan for all 57-62 Corvettes right up through 1974 when they transitioned over to the newer style 57-62 service pan (p/n 359937) with the thicker front seal.

As for pics of an original SHP (solid lifter) 3769761 pan, someone else will have to verify if Roy's orange pan above fits the bill or not. There's evidence to suggest the trap door feature (not to be confused with the two side baffles) for the SHP motors didn't actually appear until 1960. Sure would've been nice if GM just stamped the p/n's in all of them

So these things don't even have parts on them???

Do they have dates???
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Old 01-13-2011, 03:18 PM   #8
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Click the image to open in full size.
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Old 01-13-2011, 06:25 PM   #9
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I have to say, it's staggering that you have a copy of the oil pan assembly drawing, but I can't make out any of the numbers. Can you tell me the dimensions of it?

Is it safe to say, that

3769761 is only for the 1961
3789629 could be used for 57-61
359937 could also be correct '57-61?

Also, what does SHP stand for?

And not to open up a whole ' nother can of worms, but, what significance is "solid lifters"?

I'm struggling with a '61 fuelie and '62 fuelie. I'm just trying to find out if I have the right oil pans for them....
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Old 01-13-2011, 11:52 PM   #10
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HP=High Performance
SHP=Special High Performance

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Old 01-14-2011, 01:20 PM   #11
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And not to open up a whole ' nother can of worms, but, what significance is "solid lifters"?
Solid lifters (Duntov "097" camshaft) is what differentiates SHP engines (270hp 2x4, 340hp 1x4 and 283/290/315hp fuelies) from the hydraulic-lifter HP and base engines (230/250 and 300hp 1x4, 245hp 2x4, and 250hp fuelies).
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Old 01-14-2011, 01:30 PM   #12
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Solid lifters (Duntov "097" camshaft) is what differentiates SHP engines (270hp 2x4, 340hp 1x4 and 283/290/315hp fuelies) from the hydraulic-lifter HP and base engines (230/250 and 300hp 1x4, 245hp 2x4, and 250hp fuelies).
You missed one of the fuelies.
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Old 01-14-2011, 02:51 PM   #13
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You missed one of the fuelies.
Yeah, I know; they only made 118 of the 275hp fuelies in '61, and most folks have never seen one.
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Old 01-14-2011, 03:50 PM   #14
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I found this picture on ebay of the inside of a trap door solid axle pan.

Click the image to open in full size.

Based on Roy's drawing, looks to be a 3769761. ('60-'61)

Compare that to Tom's pan, which looks to be a 3789629. ('62)

Here's shot of mine so you don't have to page up:

Click the image to open in full size.

This pan was purchased out of service in about 1963.

Both pans are 3-step with one long rib on each side and a small depression at the drain plug, which is in the middle (almost) of the bottom step
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Old 01-14-2011, 03:50 PM
 
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