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Thread: Base plate vacuum check ball?

  1. #1

    Default Base plate vacuum check ball?

    Hello, I have a couple Holley 4160s (x6) and I had to switch out one of the base plates on a few and I noticed that there was a check ball on one of my plates and an open hole on my other plate. Does anyone know what that check ball is for, and if I should block it or leave it open? I have to mount two carbs front to back, and the original base plate makes it so that I can't do this properly with out too much modification. Pictures below.
    Thank you.

  2. #2
    Join Date
    Jan 2013
    Constantine, MI


    Power valve blowout protection.

  3. #3
    Join Date
    Dec 2009


    Quote Originally Posted by hotstuff View Post
    Power valve blowout protection. (Read end of page.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  4. #4


    Thank you gentlemen. I left it unblocked and my little 428 drives like a dream. James

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