Vaccum Modulator with boost

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Dec 3, 2010 | 12:38 PM

dirt track racer 81

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TECH Senior Member

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From: Hennessey, Oklahoma

Vaccum Modulator with boost

Need a check valve or anything for a vac mod th400?

Dec 3, 2010 | 12:52 PM

built408

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From: Fort Worth Texas

Transgo VPB-VAC bypass kit.

Dec 4, 2010 | 05:10 AM

silver-mod-o

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From: SETx

What he said

Dec 4, 2010 | 08:42 AM

Vince B

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From: Bloomingdale Illinois

What they said!

For applications with boost in the teens it is a good idea to run two valve in series. This way one is a safety for the other and insures that boost will not see the vac mod. Not sure about your combo but in some cases you might be able to find a port that will not see boost on your existing combination. Hope this helps. Vince