Hi Mike I use that pump style on my 455. Yes screw in for more p.s.i all around. You may want to shoot for as low as 20 p.s.i WARM at 600 to 1000 R.P.M's. Never check or make changes when the oil is cold. Due to will read higher. Remember don't go crazy high to much strees on the rear main seal...
87 G.N. For Sale. 15K Firm. Was asking 18 but the bottom line is 15. This is a rear nice G.N. Drive anywere. I took it on the Hot Rod Power Tour with ease. Orignal paint. Except hood and trunk I was sick of going to cars with it and people looking at rock chips or that good GM 80's paint. No...