Blocking off the nipples anyone

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May 3, 2008 | 09:44 PM

topher455

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Blocking off the nipples anyone

Id like to block off the heater nipples on my water pump so I have more clearance for my crossover on my turbo setup. I clamped some rubber caps on but Im afraid they wont hold up well with the heat. Plus I could really use the 1 1/2" clearance. I thought about removing the tubes and drilling and tapping the holes to 3/4 npt and using screw in plugs. Anyone done this? Suggestions? Pics?

May 3, 2008 | 10:19 PM

95GreenZ28

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From: Amarillo, Texas

I am thinking of doing the same thing. You go first and let me know how it goes

May 3, 2008 | 10:39 PM

prrc

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I want to do tha same thing. I will be watching.
Tim

May 4, 2008 | 12:42 AM

babydeuce

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From: Box Elder, SD

Pull the nipples out, tap for NPT thread, and put a plug in them....simple as that.

Jack

May 4, 2008 | 07:50 AM

hpmotorsports

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I hate to tell say ,if you block them off you will overheat for sure, coolant must flow through them.

May 4, 2008 | 08:36 AM

samdogmx

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Im pretty sure there have been a few guys that have tapped & pluged them without overheating issues.

May 4, 2008 | 09:59 AM

Project GatTagO

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From: Little Austin

Gotta loop them.

Andrew

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May 4, 2008 | 12:26 PM

1tigers

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when you have your heat off there is no flow though the heater core. a valve opens and closes for temp you want.same as plugging lines off

May 4, 2008 | 12:32 PM

#10

lt4malibu

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if you plug them off it wont overheat... the meizere pump i have on my LS1 doesnt have heater hose outlets and it works just fine

May 4, 2008 | 08:12 PM

#11

hpmotorsports

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From: N.E. FL

I know I plugged mine off and at idle it would overheat, I put a loop and it cured the problem.

May 4, 2008 | 11:18 PM

#12

G-Body

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From: Downers Grove, IL

Quote:

Originally Posted by 1tigers

when you have your heat off there is no flow though the heater core. a valve opens and closes for temp you want.same as plugging lines off

On all the LSx cars that I have seen the heater core does not have a valve, it is constant flow and they regulate the heat by closing off that section of the heater box.

On my install I used the valve from the El Camino so it does shut off the coolant flow if I don`t have the heat on. A few people have said this causes problems, but I haven`t had any problems in the 25k+ miles that I have put on so far. IIRC John B was/is? running the same heater setup as me.

A few people have recommended a valve from a astro van (I forget what year) because it has a built in bypass for when you turn the heater off.