LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Throtle Body Bypass

Old Jun 21, 2014 | 01:09 AM
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Default Throtle Body Bypass

Looking to do the Throttle body bypass on my 96 z28 m6. I think the two top hoses on the passenger side are not coolant lines. The third line which is on the bottom has a metal line hooked to it, do I connect this line to a line coming off of the drivers side? With all the crap in the way I can't even see a line on the throttle body on the drivers side? When done do you have to get air out of the coolant system? can this cause problems?

Also does anyone know where there is some classifieds for LT1's I am looking for either used or new headers and y pipe at a decent price!

Last edited by 350 groundpounder; Jun 21, 2014 at 01:19 AM.
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Old Jun 21, 2014 | 02:04 AM
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On the passenger side the top is PCV, right under is EVAP, and under that is a coolant line. There should be a rubber hose that goes 90* between the coolant barb on the throttle body and a metal steam line that runs to the back of the head. The hose has to come off.

The very bottom line on the driver side is the other coolant line. Unplug that and plug it into the metal steam line on the passenger side using a hose clamp.
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Old Jun 21, 2014 | 07:44 AM
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http://shbox.com/1/tb_bypass.jpg
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Old Jun 21, 2014 | 10:06 AM
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Thanks guys it makes sense now. But do I have to worry about air in the coolant system after disconnecting those hoses? And when I do this I need to use lots of towels to protect the Opti Spark since they don't play well with water!
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Old Jun 21, 2014 | 11:07 AM
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It's the very top of the cooling system. You're not going to lose much and the air will probably bleed out. Just watch your temp.
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