Mini StarterSmall Block/Big Block Chevy153/168-ToothStraight Mounting Configuration12 Position Rotation6:1 Gear ReductionFor up to 11.0:1 Compression Ratio1.7 HP1.4kW7.4 lbs.Natural FinishSold Individually Special Notes:Proper mounting: It is important that the starter mounting flange to the engine block is in the correct position for your starter to engage properly. See photo for reference.Fits all Small Block Chevy except LS series engines (LS1, LS6, 4.8L, 5.3L, and 6.0L)May require the use of "R" Terminal Diode Kit 555-10038, which allows the use of aftermarket mini starters in GM vehicles originally equipped with breaker point ignitions