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Old 12-04-2012, 05:45 PM
MouseFink MouseFink is offline
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Any engine with 10:1 compression ratio should start if it has a GOOD battery and starter. That means any engine with less than 10.3:1 static compression ratio or 8.5:1 dynamic compression ratio.

I have never had a problem starting my 455 Pontiac engines with Interstate 1100 CCA batteries and both had 12:1 compression ratio using 100% VP 108 octane C-12 racing fuel. One of the 455 engines had a NAPA fresh rebuilt starter and I rebuilt the other starter myself using a NOS GM heavy duty armature. You may need a fresh starter and a fresh battery with new cables. If the engine initial advance is 12 or more degrees BTDC and sound like it is trying to start an ignited mixture, back the initial timing advance down to about 8 to 10 degrees BTDC. The engine will run hotter and will not have as much power at 8 to 10 degrees BTDC , but your engine will start and you can use 93 octane pump gas.
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