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  • B&M Blower

    Hi guys. I've just bought an engine. It came with a B&M blower. How do I tell what it is? There's no numbers or markings on it. Does anyone have a pic of a 420 and a 250 Mega Blower? I might be able to see which one mine is. Also, it has a serpentine belt on it, and was wondering if I could change it to a belt like on a 8/71 blower. Thanks for any help. :)

  • #2
    Contact Weiand Tech Service (LINK).
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232-244 duration/.623" lift/114 LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

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    • #3
      I'm in Australia, they're asleep when I'm awake. LOL!

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      • #4
        If it has bolts going through the case, it's a 144 or 142. If it can fit two carbs on top and flat, it's a 250.
        If it has mount bolts only on the lower flange and only can fit one carb, it's a 177.
        Aside from that, it would be hard to tell the difference of a 420 Mega Blower to a 4-71.
        The 250 Mega Blower is flat compared to a 6-71, and it can fit two carbs. It's about as long as a 6-71, just not as tall.
        Last edited by Gen2Van; 02-06-2019, 12:40 AM.

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