[philboy]

1) I just purchased a 1947 chev dev sedan, with a 454 B&M blower.
2) The carb was a edelbrock, I have since purchased a Holley 850 built for a blower.
3) I found a air leek in the carb adapter plate to the blower gasket which I am replacing.
4) I found that almost all of the hardware was lose on the blower and plate.
5) I was told that my upper and lower wheels for the belt were wrong and the motor was over blown.
6) The blower intake looks like it has been grooved for a o ring.

#2) so I can buy the correct parts how do I identify the size of the blower?
#3) should I go with a gasket or a o ring?
#4) what torque should the adapter plate to the blower be?
#5) the top wheel is approximately 4.5 inches dia. The lower wheel is approximately 7 1/4 dia. I what a dependable boost for the street and a little track. what lb boost should it be? and are the wheels the right size?
/r philboy

[philboy]

also I counted the teeth, the top one is 44 and the bottom is 70. Is there a formula to get a 5 to 7 lb boost?

[BOBCRMAN@aol.com]

Need to know the size of the blower!!

[F-BIRD'88]

Down load and read the supercharger tech manuals at
Holley Performance Carburetors, Fuel Injection, and Fuel Pumps

Holley/weiand bought out B&M supercharger division.
They build and service al these B&M blowers.

You will find the supercharger size dimentions diagrams
and blower pulley/boost charts.
The amount of boost you can run depens on the fuel octane/ power desired/ engine compresion ratio and spark advance.
blower fastener torque specs are there too.

[F-BIRD'88]

which blower is this the B&M "250 Powercharger" or the B&M 174 supercharger? or a 6-71w single carb?

[spinn]

If you havent done this before stay around 5psi to start. Interchange pullies and tune it in for that level. On the steet with pump 92 octane fuel and a MSD btm, 9-10psi is the safe limit. Many factors contribute and results may vary.

F bird got me on track, when I did the Eforce.

I would use a carb gasket for the carb pad . The blower body to blower base could be o ringed. Then use the line gasket material and rope around the plate groove. Where the ends meet use a dab of RTV.