Z-28 Windage Tray / Oil Pan Clearance Issues - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-25-2007, 08:29 AM
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Z-28 Windage Tray / Oil Pan Clearance Issues

I am in the process of assembling my 406 SBC and have gotten to the point of closing the bottom end when I run into this issue:
With the windage tray attached to the GM recommended studs for this application (stud #1407508), the windage tray is too deep in the oil pan to allow me to bolt the pan into place by at least 1/2" if not more.

I elongated the bolt holes of the tray (#3927136) to fit the 400 and I am using the Z-28 pan that is supposed to work with this tray (#465220- superseded by #360450).
Am I just being stupid?
It looks like the strips of sheet metal tack welded along the inside of the pan should fit into the grooves stamped along the outside edge of the tray, but in doing so, the pan won't contact the block.
Does the 'ears' welded inside the pan need to go over (on top) of the windage tray instead of fitting into the grooves?
I can't believe I'm having such a hard time with something so basic.
Can anyone help?
Any advice would be greatly appreciated!
Thank you,

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Old 03-25-2007, 01:48 PM
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Just from reading your post there is one thing that comes to mind. The oil pan you are using is not designed for a 400. You mentioned that you had to elongate the holes in the windage tray due to the increased distance between the studs. Since the pan was designed for an engine with 2.45 mains, there might be interference with 2.65 mains since the main studs are farther apart causing the studs to hit the pan.

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