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09-01-2017, 10:56 PM
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Registered User
Join Date: Jul 2006
Location: Calgary, Alberta, Canada
Posts: 134
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5/8" heater core hose blowing off!!!
okay in my 64 chevy k10, I've got a 70's 010 casting high nickel sbc block, just turned into a 383 stroker, with 2003 gmc 1ton 906 casting vortec heads and intake...
cooling system was a1 before engine swap. old motor was a same 010 block from my corvette, without vortec heads/intake...only change in this setup is vortec heads and intake... I've started it up 3 times and all 3 times the 5/8" coolant line from pass front intake blows right off the heater core end!!! Heater core is not blocked... Not running a thermostat at all at this point... My heater core hoses run from front pass intake 5/8" to 5/8" on heater core Other line runs from 3/4" off top of water pump to 3/4" on heater core... because I have vortec heads, and all this conflicting info regarding bypass hoses...I don't have anything else... is my hose blowing off because I don't have a bypass hose?
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1964  K10 shortbox Stepside 383 sbc stroker under vortec heads sm420 trans / t221 tcase / corp 10 front axle / corp 12 rear axle / 3.73 gears rolling on 33x12x15 tires on 6 lug rims. 
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