Okay.
I have posted about this a couple times.
Went and found a couple links. The test unit is cheap ($42) and pretty much 100% accurate (as long as YOU don't mess up).
Here ya go...Balkamp...available thru Napa
http://www.napaonline.com/NOLPPSE/(S(if ... 0244803216
And
BlockChek:
http://www.blockchek.com/index.htm
I am sure they are available from other auto parts suppliers.
Head gasket leak detection
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Head gasket leak detection
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