LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

How much vaccuum should I be pulling?

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Old 07-14-2004, 04:18 PM
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How much vaccuum should I be pulling?

Curious how much vacuum I should get with a 236/242 cam if the valves are timied right an the tune is good. Not sure if I need to provide any more info
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Old 07-14-2004, 08:23 PM
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Well I put the guage on the motor at the port the egr valve solenoid was connected to and was pulling between 9 and 11 inches of vacuum. Does that sound about right? On the guage it says that the valve timing is late. I just readjusted my valves yesterday to 1/4 turn past zero lash on Comp R's
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Old 07-14-2004, 08:26 PM
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Re: How much vaccuum should I be pulling?

Originally posted by wicked_95z
Curious how much vacuum I should get with a 236/242 cam if the valves are timied right an the tune is good. Not sure if I need to provide any more info
With my XE236/242, I'm pulling 12" of mercury at idle. Not too bad if you ask me.
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Old 07-14-2004, 08:30 PM
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Cool...maybe a little more tweaking on the valves will get me some more vacuum. Thanks
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Old 07-14-2004, 09:04 PM
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Just as a side note, the reference you have on your vacuum gauge for timing is meant for a stock cam. A radical cam throws that vacuum reference out the window.
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