At a minimum, gasoline should meet ASTM specification D 4814 in the United States or CAN/CGSB-3.5 or 3.511 in Canada. Some gasolines contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT).
We recommend against the use of gasolines containing MMT. See Additives for additional information.
Gasoline Octane
California FuelChevrolet Cobalt Service & Repair Manual. Engine Assembly-Short Block R&R
Some manufacturer supplied short
block assemblies do not come equipped with crankshaft and dampener. In-block
cam short block assemblies may not include camshaft and timing gear. If
short block assembly does not come equipped with these components, install
components from orig ...