Originally Posted by
gmwillys
Tim,
If the starter is in good shape, the 6 volts will be able to turn it over just fine. Unless the heads and block were decked, then your compression ratio will stay pretty close to stock, regardless of diameter of the pistons. When the block and head are shaved, then the compression chamber is made smaller, thus boosting the compression ratio. A 6 volt system actually has more torque then a 12 volt. If you run into issues still in regards to cranking RPM, don't be afraid of throwing 12 volts to the 6 volt starter. The whole ignition system can handle it for short amounts of time, just make sure that the lights are not switched on, to include the brake lights. That gets expensive fast having to change out the bulbs.