Recent content by racerboy9

  1. R

    350 Water Pump Woes

    I use Zerex G05 in all my vehicle now and it is the only one that Mercedes endorses as an alternative to their own. I really doubt the G05 had anything to do with my problem. I am replacing my heater core as well as it has a split in one of the outlet tubes.
  2. R

    350 Water Pump Woes

    Earl's make the stainless inner support springs.
  3. R

    350 Water Pump Woes

    So I bought the stainless steel back plate and have all new hoses and belts on the way. Flushed the block, heater core and radiator. The pump had low miles and seems fine so I am reusing it. I am going back with the old Prestone green coolant and crossing my fingers I have fixed whatever was...
  4. R

    350 Water Pump Woes

    There is a stainless steel back plate for marine version water pump. I may go that route if it pans out. There is one on Ebay: https://www.ebay.com/itm/174555963839
  5. R

    350 Water Pump Woes

    Pulled the pump and same back plate problem as my last one. Erosion, corrosion and pinholes. Always had anti-freeze mix. I could just put a new back plate on but given the work involved it seems better to get a new pump with a more heavy duty back plate. Most of the new pumps tout being...
  6. R

    350 Water Pump Woes

    I use Zerex G05 50/50 mix. My truck originally had a 305 with a ton of miles and wiped the cam so I put a new GM 350 crate motor in and swapped the pulleys from the 305.
  7. R

    350 Water Pump Woes

    I will be pulling the pump today to have a look and will post up a few pics.
  8. R

    350 Water Pump Woes

    I am on my third low mileage NAPA water pump on my 1984 K10 4x4. The pump doesn't wear out but the back plate erodes to the point it leaks. Always has 50/50 antifreeze. It doesn't leak from corrosion but seems to erode from the water action against the back plate. If the back plate was...
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