I use a Z/28 oil pan and windage tray and a High pressure Z/28 oil pump in my 69 Chevelle. I had to slot the windage tray in order to fit the main bearing bolts stud. In a 400 sbc it's slightly wider apart. The Z/28 windage tray would not fit right in.
In a Z/28 oil pan the gap between oil pan and timing chain cover was much wider. You need a thicker gasket.
Last edited by lg1969; 07-26-2010 at 10:18 AM.