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Old 03-15-2011, 08:02 AM
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B&M 250 blower on a 396 ?

I have a B & M 250 blower, which I thought to use on a chevy 396 engine. I have some questions about carb choices and cams.the heads on the engine are merlin, 1-043c casting number. match two Edelbrock 1407 carbs good? or is it best to run with one big carburetor?, camshaft fit best on this engine to get the most power?

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Old 03-15-2011, 01:34 PM
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edelbrock carburators

thanks! what modifications must Edelbrock 1407 carburetors have to work on the blower?
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Old 03-15-2011, 03:09 PM
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Quote:
Originally Posted by rumo
thanks! what modifications must Edelbrock 1407 carburetors have to work on the blower?
In the owners manual to the carb , they explain what needs to be done. You'll need to change out the jets, needles and possibly the springs. Edelbrock recommends 1405's for blowers up to 6-71

Edelbrock Carb Owners Manual
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Old 03-16-2011, 12:57 AM
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Definitely run two fours, not a single, on the 250 blower. While my engine is a 350 SBC, and not a BBC, I tried repeatedly to run a single 850 cfm Edelbrock atop a 250 with poor results. I did that because i successfully had run on both the street and drag strip a single 850 atop a smaller Holley/Weiand 144/142 blower. While the 250 is roughly equivalent to a GMC 4:71 in swept volume, the blower case of the 250 is much lower and much longer. The result is that, whether using the Weiand/Holley center mount for a single four, or the forward single carb mount for marine use, the longer, lower blower case starves the front cylinders for fuel, risking detonation and substantial engine damage. We know this from a dozen engine dyno runs as I tried repeatedly to run a single large four barrel on a 250, and found nothing but problems. Cylinders 1/2/3 always ran 200 degrees hotter than all other cylinders with a single carb. Going to two fours, two boost referenced 600 cfm Holleys in my case, evened out the cylinder temperatures and with that, reduced the potential for detonation.
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Old 03-16-2011, 11:56 AM
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thanks for all the details, is it some pictures of the modification of the Edelbrock carburetor when it is used on the blower?
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Old 03-18-2011, 03:27 PM
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carburator plate

hey, does anyone know where I can buy a Super Charger Adapter Plate, 2-4V 250, part number Weiand 93151 - Weiand Carburetor Sealing Plates?
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Old 03-18-2011, 08:10 PM
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Summit Racing carries Weiand part 93151 listed at $ 239.95 US.
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