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Registered
Join Date: Jul 2002
Location: Sydney, Australia
Posts: 2,477
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hey gavin
my targa car is 10.5:1. i ran it single plug on premium unleaded with zero detonation issues.
however, with twin plug it runs smoother and has better low end throttle response.
i think you'd be fine with 9.8:1
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Cheers, Ryan
1969 911E (historic racer)
911ST replica (tarmac rally)
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