tough to find, need height specs
thanks in advance!
Original production line installed 69 Z28 oil pans are getting tougher to find, lots of later issue pans around, but they have a small size dimple on the front of the pan just behind the front seal. The later pan was availiable under #360450 from GM, but pretty sure it's discontinued. Corvette L82 pan from 74-77 is the same as 360450. Look on eBay, there are usually the late production pan with the dimple listed, but despite what the ad says they are not correct.
Also FWIW the production line windage trays are different too, with just a round hole where dipstick goes through, 1971 and up have a oblong hole.
The height/depth of the Z28 pan is the same as any SBC pan from 69-77.
I measured a original 69 Z pan and it seems like it's 7&9/16 depth with a level on it parallel to bench surface.
Thanks guys for the info.
what a pain in the butt .
Fortunate to get an NOS pan never used, paid through the nose, but gives me piece of mind knowing it's correct too.
I m ay need one for my white 69. Can you take pics of that dimple one the original, or any other identifying marks. thanks
I'll try, when I get it back from the shop
Been trying to post a picture but it keeps saying it is too big, even though it isn't. I can forward it to someone else if they want to try
sure, send it to me and i'll try
Quote from: WaltZ on May 12, 2020, 09:11:09 AM
Thanks guys for the info.
what a pain in the butt .
Fortunate to get an NOS pan never used, paid through the nose, but gives me piece of mind knowing it's correct too.
Out of curiosity, what is the part number on the pan ? I have a fairly early NOS pan I'd like to compare it to -
Regards,
Steve
Part number and instruction listing from my 251 pan -
Regards,
Steve
sorry Steve, don't have that info , the best I can do when it's back at the shop tomorrow, I will take pictures and post.
the machine shop believes it was possibly manufactured in Canada.
check out in Nasty Z28
http://nastyz28.com/threads/70-z28-oil-pan-question.179332/
thread #8
Quote from: WaltZ on May 13, 2020, 11:11:40 AM
sorry Steve, don't have that info , the best I can do when it's back at the shop tomorrow, I will take pictures and post.
the machine shop believes it was possibly manufactured in Canada.
That's a distinct possibility, the 360450 that I purchased many years back for my '68 build was marked "Made in Canada" on the box if i remember correctly -
Regards,
Steve
FWIW- I am Pretty sure the 360450 pans ALL have the dimple, I used a lot of them at the Corvette Shop I was at for 20 yrs. I have also body worked the dimple out with a hammer and dolly as well to make it resemble the production 302 pan, but the 360450 pans all take the big front oil pan seal, so it is not perfect but very close.
Hope this helps.
Mike.
Pic of the oil pan "dimple" and the 2 windage trays as forwarded. I guess I'll have to dig my 251 out and compare it now - I don't remember the dimple being on it, but I'll scope it out.
Regards,
Steve
Thanks for posting the pictures Steve. The bottom 1 also shows the incorrect baffle with the slot, the upper 1 is a Production line installed baffle.
Cheers. Mike
Good pics. Would I have to take off my pan to see the internal trap door of the pan, to know that it is correct. it does not have the dimple and looks similar to the pic, but I don't know how many of them look similar to the "non-dimple" one from the outside. thanks
Quote from: rszmjt on May 13, 2020, 07:53:18 PM
Thanks for posting the pictures Steve. The bottom 1 also shows the incorrect baffle with the slot, the upper 1 is a Production line installed baffle.
Cheers. Mike
Mike,
Spotted that. Pretty sure my original is round, I built the '68 MO about 20 years back, bought a GM new windage tray then - unsure if it's round or oval. It's there for the duration, anyway !
Regards,
Steve
Quote from: BULLITT65 on May 13, 2020, 08:02:07 PM
Good pics. Would I have to take off my pan to see the internal trap door of the pan, to know that it is correct. it does not have the dimple and looks similar to the pic, but I don't know how many of them look similar to the "non-dimple" one from the outside. thanks
When you mention "trap door", you aren't thinking of the '65 era Corvette HP 'trap door' pan, are you ? Z pans don't have them, biggest features are the rails on the sides of the pan that interact with the windage tray when assembled. Just checking -
Regards,
Steve
Correct, sorry wrong terminology. I was thinking that the Z pan had a baffle (internal metal shoulders) on the bottom to keep the oil down in the bottom of the pan by the pick up. Unless that was a corvette thing ?
I don't think so, but since I've slept a few times since I looked inside of mine; I'll have to look. I'll get pics while I'm at it -
I remember the '65 or so Vette had the 'swinging door' hinged door near the bottom of the pan - I thought that was what you were referring to. They were pretty unique - tough to find them, too -
Steve
The vette likely did, I had an image of my hamburger oil pan there for a sec. I had seen a oil pan on eBay that was advertised as a 69 Z/28 pan that had a catch on the inside that looked like it prevented the oil from rushing to the back of the pan, and kept it around the pick up.
65 Corvette 327/365Hp had the swinging trap door in the pan, pan was very long in the bottom and was only used with no PStrg.
68/69/70/71/72 Z28 pan had rails on the side that ran very close proximity to the windage tray, also a little 45* angle piece that goes side to side and is located rite where the sump transitions to the front.
Pretty sure 73/Z28 was just a stock pan, same as 74.
Quote from: BULLITT65 on May 13, 2020, 08:02:07 PM
Good pics. Would I have to take off my pan to see the internal trap door of the pan, to know that it is correct. it does not have the dimple and looks similar to the pic, but I don't know how many of them look similar to the "non-dimple" one from the outside. thanks
A stock GM oil pan from 67-77 is super close in external dimensions, in fact we have made Z28 pans by duplicating the side rails and Tig welding them into a stock pan after the internal baffling is removed.
Easiest way to tell a Z28 pan while it is installed is to look for the factory pinch spot welds that are on the side of the pan, they run from back to almost the front, stock pans don't have them past the mid way point. I'm thinking there are about 6-7 per side.
In Steve's comparison picture above, it also looks like the local recess around each windage tray bolt is deeper on the slotted version; or is that just a difference in shadows?
Quote from: ZLP955 on May 14, 2020, 12:42:28 AM
In Steve's comparison picture above, it also looks like the local recess around each windage tray bolt is deeper on the slotted version; or is that just a difference in shadows?
I took the picture with my old phone, pretty sure it's just shadows. The original windage tray has been glass beaded so that might be why. I'll compare both trays and measure the recess and re post in the am.
Mike.
Great, thanks Mike.
thanks for the pics
I measured the windage trays and they are the same except for the dipstick hole, the recess for stud nut is .200 deep on both.
Also noted that later model 360450 pans are easily identified by black powder coated insides, original pans are bare steel. Also the later 360450 pan has ribs were the gaskets are instead of indents, so that is a identifier externaly that can be used.
Still having trouble posting a picture, maybe Steve would post again for me?
Thanks.
Mike
Here you go, Mike - you'll have to recap the notes in the pans, I couldn't magnify without blurring the writing to the point you can't read it. I'll try to resize it again -
Regards,
Steve
251 pan pics - first time this one has seen the light of day in a while. This is as found, original box is dated 9/24/74 (although the installation instructions are dated 2/69). I realize it's a service NOS part, not assembly line original, so I'll have to dig my original pan out and see if it differs. 6 spot welds for each windage tray ledge, "A" marked plug, and it is stamped about 2 inches back from the front of the pan with a code. I'd like to draw a theory that service pans were stamped, I'll look for evidence on the original when I can get to it.
Regards,
Steve
Last 2 -
Thanks for posting the pics. Only problem is I can't read the note cards in them. It looks like the bottom one is more squared off around the bung? what are the differences between them, since I can't zoom in great? thanks
Try this. Really had to squeeze it to get it to fit -
Reads left to right: 1969 original z28 pan, L82 pan w/ dimple 74-77, Later issue 360450 w/ dimple, 2 different gasket ? dimples (best I can make it out, better have Mike clarify when he sees it).
Steve
Yes that is correct , the pan on the extreme rite is a 360450 and it's powder coated ? inside, plus it has ribs on pan rails to imprint the gasket, original GM pans had indents . Middle pan came off a L82, and left pan is a original 02B Z28.
Sorry guys, should have made cards bigger.