Hot Rods 671 blower snout length SBC ?

Is there a standard length for a 671 blower snout on a Weiand 7136 intake on a small block Chevy?
Thanks

 

I don't have my catalog in front of me but go to BDS I think 3 1/2 4 inches but not for sure

 

I think each company has there own length, 3.75, 3.5, 3.90 for short ones.

 

That's a pretty standard set up with that intake assuming you don't have anything funny going on for the crank pulley call any of the big blower guys (Dyer, BDS Etc...) they will have a drive set up for that. Or tell you the length.

 

What type of crank you got?

 

Different lengths are for different brand engines based on the 71 series case small block Chevy usually takes one particular size big block takes A particular size ,there different size Chrysler , Ford & so on
If you're too short you can also get a spacer to make up the difference without buying a new snout, also flip the pulley is an option

 

Thanks for the info guys.
I'm waiting on the current owner to give me the dimension.
I think it is 3 1/2" but need to know for sure. It seems like that number (3 1/2") is about right for a SBC with a short water pump.
One engine I have has a stock 327 crank and the other a old welded up Crankshaft Co. 1/2" stroker and is set up for 8:1 compression..

 

Are you going to run a damper or V groove accessories pulleys ? This all comes into the length as well, all the sizes I listed were listed for a sbc but through different sources, Good Vibrations, Weiand and BDS.

 

I run a billet steel hub, a single groove V belt pulley and the 2" Gilmore pulley. I could give you a measurement off the face of the block to the blower pulley if that would help.

 

I'm also running a steel billet hub with one V-belt groove. My manifold is an old Weiand race manifold. The snout appears to be 3 7/8" near as I can measure without taking off the pulley. See the pics.
If you use the damper and the adapter/pulley arrangement you will add about 3" to the lower pulley and will need a longer snout or to put the upper blower pulley on cup forward.

 

Take your front hub and shrink a sleeve over the seal area and machine to BBC seal dia. and machine front cover for the BBC seal, that way the belt loading does not split the SBC hub along the keyway.

 

If you stay under 5 pd boost stock balancer 0k
It will live even with a single key way ,
( I have ran 12 with no issues with 8mm belt 8:71 @ 6,500 RPMs)

 

SBC crank snout is too short so all the load pressure from the belt is at the end of it at the seal area. That along with a long 7/16 bolt (un-determind strength) that will stretch, the hub can loosen over time and roll the key out of the crank and tear stuff up, It may not have happened to you, but it has happened to others. Its a preventive maintence tip. And this comes from 25 years of running blown small blocks. Switched over to a BBC snout and 3/4" hub bolt

 

Mine looks to be 3 7/8's as well, although mine is on a BBC with top pulley backwards. I need to get a longer snout so I can turn it around.

 

What you say can happen , (Blower Crank hub / balancer ) ,, Install crank support , not expensive .
My first Blower 6-71 over 30 years ago , Ran a sbc 400 cast crank, stock rods ,stock balancer , stock Single Kay , 6,500 RPMs under boost 13.5 8mm belt ,over 10,000 miles drag, street race ,daily driver, Then Burnt block across cylinder, because no O ring block , Re-ring juck yard motor that I honed and stuck Forged pistons in , No crank support, this combination Ran 6:80s in 1/8 over 3,200 pd car ,when I tour motor down I found stress cracks all through the crank , but I do not think most will run there motor this much & hard in a Year in a Half , I allso run in Blown Out Law