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  #1  
Old 03-17-2006, 04:58 AM
mopr8u mopr8u is offline
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Default 671 blower manifold for 360

Hi guys,

Does anyone have any ideas how to get a 671 blower manifold for a360 smallblock?
BDS seem to be the only shop to stock them, Has anyone made an adaptor plate to fit an aftermarket manifold for a blower.
Any advise would be appreciated.
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  #2  
Old 03-18-2006, 07:06 AM
moparhippy moparhippy is offline
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Default 671 blower for small blocks

you might try dyers blower service. the've been around a very long time and make blowers for every mopar engine. they sell kits or a piece at a time. a kit for a big block starts out at $2500.oo
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  #3  
Old 03-24-2006, 06:26 AM
mopr8u mopr8u is offline
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Yeah, I have already had a chat to them.
Seems they will not make a 671 blower manifold for a 318/340/360
unless you buy a complete blower kit - Not much use to us mopar guys
who already have a blower.
BDS make a 2 piece unit which is an offenhauser manifold with an adaptor
plate welded on top but for some crazy price like $700 - 800!!!
Strange that not many guys in this forum havnt come across this situation before!
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  #4  
Old 03-24-2006, 07:11 AM
sanborn sanborn is offline
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I don't think anyone makes an intake to mount a GMC supercharger to a small block Mopar. If you want one, you must adapt it to an existing intake.

It's not that difficult, just requires some planning, time and a vertical milling machine. I would not weld the adapter plate to the intake, I would just bolt it.

Before you get started, do you have the blower drive system? If you already have a drive system, that may dictate exactly where on the intake the blower will be mounted.

About the intake. Your manifold will want to be totally open, all of the internal passages should be cut out. When you get through, you will have an opening about 4" wide by about 14" long. Then you must surface mill the intake flat---parallel to the crankshaft centerline. In the case of a small block, this would mean clamping the intake down to the milling machine bed, making sure the front and rear intake seal cast part of the intake was the only part of the intake touching the bed. Then milling the surface that formerly mounted the carbs perfectly flat. Don't mill off any more at the front of the intake than necessary. You will need to cut a large amount off the rear of the intake. After milling flat, you will probably need to redrill where the carb studs were. And if you have enough material, go to 3/8" USS threads.

You will also need to fabricate a "pop off" valve for the intake. This is usually easiest in the vertical area between where the carbs were originally mounted.

For the adapter plate, I would use 3/4" aluminum. You will need one bolt pattern to mount to the intake(eight holes, countersunk) and the necessary bolt pattern to mount the blower. Exactly where you mount the blower may be determined by the blower drive system.

I hope my explanation made some sense.
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  #5  
Old 03-25-2006, 06:58 AM
mopr8u mopr8u is offline
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Default

Thankyou for that info, it proved very helpful.
Yes I do already have the drive system.
I have taken your advise & used a manifold I already had -
Its an edelbrock quad duel plane manifold.
I got the top milled, Got a aluminium adaptor plate made (Not cheap
& bolted it to the manifold with high tensile bolts (I did not mill the manifold too much as I didnt want the blower to sit too low -May as well flant it eh?)
Got the pressure relief valve added to the location you suggested.
The manifold had spread bore inlets(4 intake holes for each 4bl carb) as it is a duel plane, Do you think I should cut them out or leave them as is?
Or do you think that the manifold that I have used will be unsutible for a blower?

Thanks mate
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  #6  
Old 03-25-2006, 09:49 AM
sanborn sanborn is offline
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The Edelbrock manifold should be fine for the blower application.

Yes, do remove all the internal carb passages in the intake. The area directly under the blower should by totally open all the way down to the "floor" of the intake. Why? In reality the flow from the blower into the intake is not uniform---the flow is really greater at the front of the intake than the rear of the intake---so you want the flow in the intake to be without obstruction so the flow can equalize into the cylinder heads.

Just make sure when the blower is mounted on the intake----the crankshaft is parallel to the blower rotors---if not you WILL have a belt problem.
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  #7  
Old 03-27-2006, 08:35 PM
BDS 871 Cuda BDS 871 Cuda is offline
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Default Indy has blower intakes.

Quote:
Originally Posted by mopr8u
Yeah, I have already had a chat to them.
Seems they will not make a 671 blower manifold for a 318/340/360
unless you buy a complete blower kit - Not much use to us mopar guys
who already have a blower.
BDS make a 2 piece unit which is an offenhauser manifold with an adaptor
plate welded on top but for some crazy price like $700 - 800!!!
Strange that not many guys in this forum havnt come across this situation before!
INDY sells blower intakes for around $800 to $900
Dont know to much about them. They make Big block intakes for sure.
360 ? You would have to call them.

If your having one made, they have to be 100% dead on or they eat belts!
What pullys? 1/2 inch pitch pullys make the belt jump at a higher boost
or higher rpm. Most street/strip guys run 8MM pullys and belt.
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