Just so everyone knows for future reference: the blockheater I recently installed in my truck is a Zerostart unit. Cast brass body, heater type cord with a plug cover. Its long enough to route to the grill on the driver side. Mine is a 1000W unit but they also carry the standard 600W. They are made in Canada. Construction is solid and well made. Installation went easy and has instructions.
Zerostart also sells the plug separately if you want to keep a spare/replace it and take a chance of the unit leaking/popping out.
The block heater in my truck I pulled seemed to be factory installed solid brass body and 600W with heater type cord. O-ring was leaking and cord was frayed at multiple locations. Mileage was about 180K.
Zerostart part numbers are as follows, for 6.2L and 6.5L Diesels:
replacement cord(fits both models) 3600006
They also carry a large assortment of heaters for other applications.
1985 K20 Chevy pickup, 6.2L N/A C code with J code 4544 IP&intake, Fluidampr, 2qt oil filter, dual early spin on fuel filters with inline heater
CS144 140amp alternator with dual belt pulley + military pulley modification + belt tensioner, Autometer Tachometer, headlight relay upgrade
4/0 starter and crossover cables, THM700R4 w/ cooler, NP208, 3.73 s/f, C30/1 ton springs (3 front, 9 rear)
Superwinch locking hubs, front & rear Eaton Positraction, BFG Commercial Traction 235/85/R16E tires,
dual 2.5" glasspack exhaust, Z75 quad front shocks, Class IV 12000 lbs GTWR trailer receiver, headlight relays, CB and Ham Radio.
2019 Chevy 1.6L TurboDiesel Equinox LT AWD
Allis-Chalmers CA, Case 530CK Loader/Backhoe with 188D 3.1L N/A Diesel engine, Eager Beaver 5 ton dual axle trailer, MEP002a Onan Diesel generator