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Old 09-10-2017, 07:59 AM   #9
roger55
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Join Date: Feb 2010
Location: San Angelo, Tx
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Re: 56 truck heater hose routing - overheating

It sounds to me like the bypass holes where the water pump mounts to the engine are blocked. You didn't happen to make your own gaskets for those and not put in the holes did you?

Another possibility:
Is this a Vortec engine? The L31 truck small block is a Vortec.
If so, those need another bypass because they don't have the built in as all the older small blocks do. Vortecs use a bypass hose just like all big blocks do.

Not having a bypass would cause an issue just like you describe.

Last edited by roger55; 09-10-2017 at 08:33 PM.
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