C3 Unterboden

[Porter]

Och, das wußte ich auch noch nicht. Aber wie Mark69 schon erwähnte gab es das laut Black Book ab ´76. Zitat daraus :
" Engineers put a partial steel underbelly in the forward section of Corvettes starting in 1976 for added rigidity, weight reduction, and to better isolate the cockpit from heat generated by engines calibrated to run hotter. Higher engine temperatures were intentional, one way to increase efficiency and partially offset emissions-related power losses."