The 1991 ZR-1 engine is the LT5. Extremely complex in its design, GM out-sourced the manufacturing to Mercury Marine. Mercury was probably the best choice because of their expertise in all aluminum engine manufacturing. GM co-designed the LT5 with Lotus. To date, the LT5 is, if not the best, is one of the best engines ever built. If properly maintained, this engine can live well beyond 200k miles! Always remember to change the 10 quarts of oil every 3k miles or every 6 months! This car still holds the endurance record. (Hence the King of the Hill classification) A stock model was driven at 170MPH+ for 24 straight hours while covering over 4000 miles. I'd like to see that from an obscenely oversized-single-piped ricer! Ha!
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