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Re: 400 Block
for the oil gally holes, probably was a racing motor at some point in time and they were plugged so the oil would drain down the back of the block and the front, though the time chain, elimantin drain back on the cam and rotating assembly for less windage which equal more horse power. As for the steam holes being plugged, I have no idea. eberything i've read and heard says if you dont have those opened, they'll over heat like crazy. Chris.
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its a work in progess.
71 c-10 lwb, in the middle of frame off restoration.
69 c-10 swb, drag truck, 406 sbc, balanced, comp 292 cam, ported, polished, gasket matched, and bowl blended pro comp 210cc heads, 2.02/1.60 ferrea valves,1.6 roller rockers, re curved hei with msd 6al box, 2-step rev limter, accel 300+ wires, ported victor jr intake, holley 750 double pumper carb, dynomax 1 5/8 headers, 4 spd munci m-20 with super case and iron midplate, mr. gasket vertigate shifter, 5.38 pro gears with full spool, 33 spline moser axles and c-clip elimators, line-loc, 5 gal fuel cell, holley blue pump.  
7.807 @ 88.37mph 1.60 60FT
80 g-20 van, tow rig, cammed 305, th350, 10 bolt
88 jeep wrangler, dd, 258, ax-15 swap, 4.5" lift, 33x12.50's, lockers, 3.55's
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