Help me solve a cooling issue. Pic's inside.

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Nasty-LSX

TogetherforeverCovid19
Joined
Nov 22, 2014
Posts
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Location
HOUSTON TX
First Name
Mi Hung Lo
Truck Year
85/86/87
Truck Model
c10/k10/k20
Engine Size
LSX
Bypass is drilled in block,but some use more bypass,I don't think vortec blocks are drilled for bypass,so some use heater core as bypass. If your block doesn't have this hole,or it's plugged you have to provide bypass some how. I thought maybe yours was plugged or maybe vortec block.
My block and water pump do have the extra hole as you shown in the pic. Thanks for post so that for other to see. :cheers: I have a 1999 Vortec in my 80 Z28 and it also had the bypass hole for water pump.

Here is the Donor.

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And pics of the block and bypass.

 

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