Technical Flat Head main bearing dilemma .

I’m building an 8ba using the Scat stroker kit. My main journals all measure 4.998. After I install my main bearings, torque and measure, I’m coming up with .003 - .0035 bearing clearance. The block and caps seem to be in good shape . I know, back when, .002 bearings were a common thing but seem to be as rare as hens teeth now. I’ve also considered using shim stock to tighten my clearances . Anybody have any ideas or opinions on the best move forward?

 

Found some NOS .002 bearings. Perfect fit.

 

Is the crank small ?

 

We line hone the main bores of all our blocks to the spec we want; most every old block needs it anyway.

jack vines

 

If your main journals measure almost 5"your flathead must be from a ship.

 

Ha! sorry , 2.998.

 

Do you cut your caps ? We thought about making a jig for the mill.

 

The Sunnen CPG-750 cap and rod grinder is the shop standard for nipping main caps for line honing.



jack vines