Gain extra benefits by becoming a Supporting Member Click here find out how!

Classic Performance Products Classic Industries
American Auto Wire
Danchuk Catalog
Hellwig Products IncPerformance Rod & CustomNu-Relics Power Windows

Username Post: 69 Z28 Oil Pans and Windage Tray        (Topic#356382)
Valued Contributor
Posts: 3142
Loc: Chesapeake,VA,
Reg: 04-22-02
05-12-19 06:38 AM - Post#2766222    

This car has had a chronic oil leak at rear of pan. I dropped the pan to discover the windage tray differs from what I've seen on this era SBCs plus it doesn't match McNeish's pictured curved edge windage tray.

Please take a look and comment:

The pan itself appears to be original:

The left rear corner of the pan is cracked at the horizontal surface and is not parallel to the rails. I can weld that up and straighten the corner if the pan is indeed original, but that doesn't answer the question of the flat windage tray.

I'm ready to pull the trigger to order a replacement pan, windage tray and pickup (PO did not weld pickup to pump body) if this pan and tray are not original and would greatly appreciate any input. Additionally, any recommendations on the pan gasket would be greatly appreciated. Cleaning the timing cover seal is not going to be easy with the engine in the car.

To remove the pan I did the following: drop idler arm from frame; loosen exhaust at manifolds; loosen trans mount bolts at trans; drain radiator and remove lower radiator hose; remove distributor cap; drain oil; remove starter; remove bellhousing dust cover; remove through bolts on both mounts; jack up engine with 2X6 on floor jack at RH exhaust manifold....drop pan.


Original builder of the Gobstomper - '56 210 9 passenger wagon now in other's hands. Current Ride is '69 X33D80 Z28 Camaro

Mad Professor 
Posts: 126

Reg: 12-30-08
08-29-19 07:16 AM - Post#2774387    
    In response to vabeach56wagon

I have that era motor in my 68.

It was purchased NOS from GM as a 1969 fitted block 370/350. Hi-nickle content SPHP. Came with 11:1 TRWs and full floating pins. I think Z-28 hardware was the same.

Windage tray is curved. Motor is in car so can't take pictures of bottom end.

Heads were 202 w/screw in studs/guide plates, mildly cleaned up/ported. Crower valve train. Bottom end clearanced/balanced. Eldebrock single plane and 4150 Holley. Ran accel points with curved dist. 6500-7000 rpm was no valve float or point drift.

Block/heads/machine work were trued/surfaced by a machine shop that did factory Lotus motors, for those running Lime Rock Ct. I think motor was close to 12:1, all the valves clearanced the pistons O.K.and I ran 100LL for fuel. No knocks with 36-40 degrees advance.

Not sure about the pan? I think the baffles were a bit different? I put in a GM high volume pump and brazed the pickup in so it was just a little above bottom of pan.

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package

Edited by Mad Professor on 08-29-19 09:51 AM. Reason for edit: No reason given.

Posts: 1

Reg: 10-10-19
10-10-19 08:37 PM - Post#2777613    
    In response to vabeach56wagon

Your pan looks to be correct for a first generation Z28, but the windage tray is not. You need the curved one #3927136. Also, to mate correctly, the baffle rails inside your pan need to bent out about 45 degrees or so. It appears the previous owner flattened them against the pan to fit the other windage tray.

Posts: 489

Loc: Columbia, MO, USA
Reg: 08-31-02
06-29-20 07:28 PM - Post#2797485    
    In response to deano32

Might think about the fact that Chevy has two trays, the early one and a later one like you are dealing with.

I installed the early tray in my old junk301 way back then. Also lowered my '55 truck oil pan pan 1" for more oil cap.


Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.125 seconds.   Total Queries: 16   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 11:40 PM