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70-81 2nd gen F body Upper Cowl Sandwich Plate Kit for use with PTFB Gen II G-Braces STREET click for more pics and product details


The upper cowl area where G-braces attach is a ledge consisting of three pieces of sheet metal spot welded together at the factory. The G brace mounting points are almost centered on the large air openings on the top of the cowl which are the weakest areas.  Although the short right angle lip adds a little rigidity to the ledge the sheet metal ledge itself isn't particularly rigid and you can actually flex the stock ledge with only your bare hands. Just imagine the forces during hard cornering, braking, or when hitting a bump or dip in the road.

There's almost constant pushing, pulling, and twisting forces transmitted by the G-braces as the car is used. This kit is designed to stiffen the ledge, provide additional resistance to shear stresses, and spread the forces transferred by the G braces to a wider area. If you are planning on using the car for auto sports consider our RACE version of these pieces.

The Lab-14 steel plates above and below the ledge create a sandwich and are bolted through the pinch welded ledge of the cowl.  This stiffens the ledge and spreads the force from the brace over a much wider area which spreads the forces out to the horizontal sheet metal between the openings on the top of the cowl. The Lab-14 plates create a wider thickness for shear forces transferred through the G brace mounting bolts to act on by more than doubling the thickness of the ledge.

This street version of the Lab-14 upper cowl sandwich kit is finished in black PPG Epoxy Primer so you can paint to match your car and includes the 4 plates shown as well as instructions and locking mounting hardware including matching hardware for the G braces. Scroll down here for installation instructions.