How about drilling and tapping for a screw in pipe plug?
1995 K2500 Suburban, bought it brand new in Florida!
4.10 gears. Best fuel mileage: 19.5 highway/15.5 city/12 towing
3 injection pumps in the first 4 years (1 at 15,600, next at 15,800, and the 3rd one at 48,000 miles)
PMD relocated behind bumper
K47 Air Box, boost gauge
DiamondEye 4" exhaust with downpipe, 2-1/2" mandrel bent crossover
Heath Max-e Torq and Turbo Master set to 11 PSI
New fuel and brake lines at 118,000
New fuel tank, and Spectra fuel pick up at 125,000
New Delco TS1012 sock to replace $#@%! wrong Spectra pickup gas sock at 127,000
Leroy oil cooler line kit, Hydroboost and hoses at 134,000.
9 bladed fan and new Hayden fan clutch at 135,000
Brand new Peninsular Diesel AM/GEP upgraded engine with 18 to 1 pistons, forged crank, forged rods, dual thermostat and HD water pump, etc., at 138,500