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sparkmanttx

How much vacuum on 425 Nailhead?

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Can anyone tell me how many inches of vacuum I should expect out of a 425CID, 360HP Nailhead from a 64 Riviera?

Thanks in advance for any help.

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Sparky, I believe any engine in good condition should run 17 or 18 inches of vac. at idle if its stock. laugh.gif A race cam will lower vac. readings. crazy.gif

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There was a thread on here talking about how some nailheads did have some "cam" but I think that ended with the 401s in the late 50's though don't know for sure. They are said to even have a little "rump" at idle.

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Thanks for the input guys. Sorry, I haven't been on the computer in a while but I appreciate this information. It sounds like I should be OK with a stock cam.

Have a great day.

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