For those of you that have plummed an indy block for individual lifter oiling, what size line from the oil galley to the distribution block?

3/16 steel line. -3 fitting. Restricted at the block with an .050 jet

I'm thinking that at .030 per lifter equals .480 which is right at half an inch so the main line to the distribution block should be a -8 or is that to big?

No you have to add the areas not the diameters. If you have a 0.030 hole for each lifter then that is only 0.0007 sq inch per lifter. 16 of those is 0.0113 sq inches which is the same as a 0.120 line.

Thanks for that info

A 'rule of thumb' in process piping is that every 90 degree turn in a pipe can represent an approx 6 % flow reduction (so your apparent ID is 6 % smaller)....so if you have numerous right angle turns in series the reductions build upon themselves....So it's typically smart to go up one size for every 360 degrees of total bends....or just use larger OD and/or Longer radius fittings at the turns. Sometimes you need to run tight radius 90 deg fittings in and out of coolers, but these can typically be drilled/enlarged and the inside radius of the fitting can be chamfered.