Re: oil pump pickup
John-----
The GM #3989075 baffle was shorter than the 3927136. Otherwise, it was similarly configured, though. It was retained by 3 studs rather than the 5 used for the 3927136; the baffle did not extend to the #2 main cap position (no baffle I know of extends to the #1 main cap position). I had to trim just a "skoche" from the front of the 3989075 to get it to fit the 3820000 pan without interference. I think that it would be possible to trim much more off the front of a 3927136 and "convert" it to the 3989075 size and configuration.
I don't recall any plug in the block under the rear main cap for small blocks. Check to see if any of the holes are threaded as if for a plug installation. I don't think you find any threads and I know there were no soft (drive-in) plugs used in this area.
The main cap torque specs for 327 passenger car engines as published by GM is 75 lb/ft. That's what I'd use. Trucks are 70 lb/ft. I don't know why the difference. Although no 327 ever used 4 bolt mains, the torque spec for the outer bolts of 1969+ 302 and 350 cid engines with 4 bolt mains is 65 lb/ft.
John-----
The GM #3989075 baffle was shorter than the 3927136. Otherwise, it was similarly configured, though. It was retained by 3 studs rather than the 5 used for the 3927136; the baffle did not extend to the #2 main cap position (no baffle I know of extends to the #1 main cap position). I had to trim just a "skoche" from the front of the 3989075 to get it to fit the 3820000 pan without interference. I think that it would be possible to trim much more off the front of a 3927136 and "convert" it to the 3989075 size and configuration.
I don't recall any plug in the block under the rear main cap for small blocks. Check to see if any of the holes are threaded as if for a plug installation. I don't think you find any threads and I know there were no soft (drive-in) plugs used in this area.
The main cap torque specs for 327 passenger car engines as published by GM is 75 lb/ft. That's what I'd use. Trucks are 70 lb/ft. I don't know why the difference. Although no 327 ever used 4 bolt mains, the torque spec for the outer bolts of 1969+ 302 and 350 cid engines with 4 bolt mains is 65 lb/ft.
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