390 w/open chamber heads

Treblig said

Wouldn't the best time to surface a block be right after you bore and hone (with a torque plate)?? That way you can get an exact reading off the cylinders for being perpendicular to the bore in both axes. That should get you almost dead parallel to the crank if the bores were machined perpendicular to the crank. Isn't that the best way??
Using the bores vertically you would come out with the deck dead perpendicular to the cylinders...??

treblig

Click to expand...

No.
Your making the assumption the bores are perpendicular to the crank CL and to each other. This is production line machining that needs to be corrected.
Not a single automotive machinists is going to take the time to mount an indicator to the boring head, and sweep the bore top to bottom to align its axis with the boring bar. For one its time consuming and two its incorrect.
Your main line is your datum reference, with the crank/cam CL setting the angles. Thats why you do operations in the correct order to correct errors in the factory machining.

Also- simple formula to remember.
MPH*Final drive Ratio*336 (constant)
------------------------------------
Tire Dia
=RPM
ie 70mph*(4.10*.70 OD ratio)2.87*336
-------------------------------------
26" Tire
=2596 RPM @ 70 mph without slippage.