1977 Chevrolet El Camino There Two 2 Thermatic Vacuum Switching Valves Water

1977 CHEVROLET EL CAMINO
185,000 MILES
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There are two (2) thermatic vacuum switching valves in the water jacket at front of the intake manifold. how do I differentiate between the two (2), also from what to what for what purpose?
Mar 20, 2013 at 5:02 PM
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HMAC300
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here is for a 350 as you didn't state engine size a 305 will besimilar see pic. if anything different then get back to me.
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Mar 20, 2013 at 5:09 PM
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