Comp. Ratio
Supreme Member
Joined: Sep 2001
Posts: 6,111
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From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
I wouldn't venture much beyond 10:1. Different heads will have a slightly different absolute detonation point. But will not vary that much.
Better to snug up the cr to a usably close but safe level for the fuel your going to use and concentrate on airflow improvements to get your target horsepower level.
You can make serious horsepower at 9.8:1.
Better to snug up the cr to a usably close but safe level for the fuel your going to use and concentrate on airflow improvements to get your target horsepower level.
You can make serious horsepower at 9.8:1.
Supreme Member
Joined: Nov 1999
Posts: 1,507
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From: Elizabeth, Colorado
Car: '94 Corvette
Engine: LT1
Transmission: 4L60E
Heck, up here in the Rockies, I would bet you could go to 11:1.
--That's of course if you could find 93 at the pump. Most of are gas is 91 for premium & 87 for regular.
High altitude has that slow burning effect on fuel like higher octane does.
Ron
--That's of course if you could find 93 at the pump. Most of are gas is 91 for premium & 87 for regular.
High altitude has that slow burning effect on fuel like higher octane does.
Ron
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