Technical > Matt Shaff's Engine Shop

SBC crankshaft hub w/6:71

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dreracecar:
No, not enough market and takes too much material to machine. I couldnt even get Leach at RCD to make a sbc id to bbc od blower hub even tho I had sent him 3 blown-up hubs(So, would you like to buy another?) thats when I added an over tube to the hub and machined it for a bbc seal myself.

  What is made is a post that has a SBC register on one end and the other end has a register for the support bearing. The post is bored for a long stud that threads into the crank and a nut tightens the post and hub to the crank. Now you shim the front plate to the block adapters allowing some crank endplay. Get your overdrive combo figured out so you will leave the bottom pulley alone and just change the top one. On my 375 SBC I run a 64 bottom and a 1440 belt and by changing the top I can go from 2% to 25% over.
   I dont run a girdle because I had my crank built with a BBC snout and a 3/4" hub bolt---zero flex with that combo

Paul New:
I run a Bryant 3.625 stroke BBC snout crank in my SBC with a 3/4" bolt 6.60's @ 206 mph 24lbs of boost. One of our other engines ran a Cola 3.48 stroke double 1/4" key way with a RCD crank support and hub 7.20's @ 190mph. We also have a BRC 3.48 stroke with BB Chrysler snout, 3/4" bolt, Milodon gear drive, and a RCD hub that may be for sale

George:
The BBC crank snout is the best way to go for sure but I am using what I have. It looks like ATI has a hub that will do the job. From there I will have a piece built to bolt inside the pulley and into the ATI hub. I'm going to need to make the bottom pulley size compatible with the MSD crank trigger ring.

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