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Jim Brierley · 12-09-2019, 12:03 PM

The crank in Brett's engine is a BB, the heavy counterweights were installed by official Ford rebuilders, never from the factory. Reducing bearing diameters takes away some of the rigidity of the B, BB and C cranks, one of the main improvements over the A engine. A rods are smaller in I.D. than B's, so even less rigidity. I'd go with the B block, even if a small amount of cracks need repairing. Terry Burtz is also working on a new block, with 5 main bearings, full pressure, and other improvements. It will be very nice!!!

12-09-2019, 12:03 PM	#50
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,092	Re: How much better is a B block than an A? The crank in Brett's engine is a BB, the heavy counterweights were installed by official Ford rebuilders, never from the factory. Reducing bearing diameters takes away some of the rigidity of the B, BB and C cranks, one of the main improvements over the A engine. A rods are smaller in I.D. than B's, so even less rigidity. I'd go with the B block, even if a small amount of cracks need repairing. Terry Burtz is also working on a new block, with 5 main bearings, full pressure, and other improvements. It will be very nice!!!