4 BOLT MAINS...2 BOLTS ON 90-92 VERY STRONG AS WELL NO AS BIG A DEAL AS TYPICAL ON OTHER MOTORS. MILD PORTING AND DIFFERENT CAM PROFILES GET THE EXTRA 30 HP ON THE DYNO BUT NOT MUCH DIFFERENCE ON THE TRACK...SEE THIS LINK AND LOOK AT THE TOP END SPEEDS AND TIMES!!!
http://corvetteactioncenter.com/specs/zr1/zr1perf.html
YOU CAN'T GO WRONG WITH ANY MODEL YEAR THEY ARE ALL GREAT!!!! STYLE~PRICE AND MILES ON THE CAR WILL BE THE MAIN FACTORS!! FOR BEST TOTAL INFO GET A COPY OF "THE HEART OF THE BEAST" AND READ IT COVER TO COVER AND ULL BE AN EXPERT YOURSELF....AVAIL AT
http://www.corvettemuseum.com/index.shtml IN THEIR STORE HAVE FUN!!! :!: :!: