LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

heater core hose sizes

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Old Mar 29, 2013 | 02:26 PM
  #1  
pimpimusmaximus's Avatar
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From: San Antonio
Car: 1984 Z28 T-TOP
Engine: 355 Lt1 w/Hotcam
Transmission: TH700R4
Axle/Gears: 3.73 4th gen limited slip
heater core hose sizes

I'm sure its been asked, but ive searched and can't find it. What size hoses go from the water pump to the heater core. I am NOT buying the OE ones, when I can buy heater hose by the foot. BTW, which core tube do the upper and lower heater core tubes connect? eg. lower to larger etc.
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Old Mar 29, 2013 | 02:59 PM
  #2  
W.E.G.'s Avatar
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Joined: Dec 2012
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From: northern VA
Car: 88 Sport Coupe Camaro
Engine: V6 2.8
Transmission: Borg-Warner T-5
Axle/Gears: RPO/GU6: 3.42
Re: heater core hose sizes

See https://www.thirdgen.org/forums/post...15-post11.html

Originally Posted by Rayzor32
3/4" hose from the heater core to the water pump, and the 5/8" hose goes from the heater core to the shutoff valve and then to the manifold.
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