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Matt Shaff's Engine Shop / Bad main bolt Heli-coil

« on: November 10, 2015, 02:36:42 PM »

Years ago I had to have a heli-coil installed in an outer main bolt location on a 4 bolt 427 Chevy. The machinist drilled and tapped the hole at such an angle that the main bolt is canted enough that it rubs against the top of the main cap.  It's actually difficult to install that main cap without lifting the cap and inserting that bolt first.  I would like to use the block now to make considerably more horsepower for a FED and I would like to install main studs. Is there anything I can do to correct the helicoil repair and salvage the block? I used the block for many years after the faulty repair, but only in a street car.
Thanks,
Mike