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Thread: Is a 650 Holley Spreadbore a good carb for a 350 HP 396 CI engine?

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  1. #1
    jondebar Guest

    Default Is a 650 Holley Spreadbore a good carb for a 350 HP 396 CI engine?

    Not racing the SS 396 Chevelle. Just want something for under 4200 rpm.

    Was happy with a 650 Holley back in the 70's.

    What are the pro's and cons of vacuum or mechanical secondarys?

  2. #2
    Join Date
    Dec 2009
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    Actually, that would be a great carburetor for your stated application.

    QUESTION: How do I know if a vacuum or mechanical carburetor is best for me?
    ANSWER: For street cars the vacuum secondary carburetor works best on mid-weight or heavyweight cars with an automatic transmission. They are more forgiving than a Double Pumper is because they work by sensing engine load. The mechanical secondary carburetor is best on a lighter car with radical camshaft and a lower gear and manual transmission or on a car that is going to be used for racing purposes.

    http://www.holley.com/data/TechServi...Carburetor.pdf (read 2nd page for good mechanical secondary info)
    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.

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