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11-12-2003, 07:52 AM
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#2 |
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Moderator
Join Date: Aug 2000
Location: Milan, OH
Posts: 2,699
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General rule of thumb is a 3% to 5% increase in output for every full point of compression that you can raise the motor. The SBF responds extremely well to increases in compression, especially if you keep the port velocities high which you will with the small port volume of the GT-40. Go for it. I've raced my old P-headed motor on 93 octane gas at 13.0:1 compression so don't be afraid to go for as much compression as you can squeeze out of the combination.
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Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!" |
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