oil pan stock 1969 z28

[BULLITT65]

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

[z28z11]

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

[z28z11]

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

[BULLITT65]

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 ?

[z28z11]

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

[BULLITT65]

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.

[rszmjt]

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.

[rszmjt]

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.

[ZLP955]

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?

[rszmjt]

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.

[ZLP955]

Great, thanks Mike.

[WaltZ]

thanks for the pics

[rszmjt]

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

[z28z11]

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

[z28z11]

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