we use it on a 477 BBc with a old style ( pre Hp ) 1150 and it smoothed up the idle ,and lowered the 60 ft by .05 and about a .10 in the 1/4 and 1-2 + in mph its on a 70 1/2 all steel camaro with a working 4 inch cowl sealed to the carb pan , IMO its a good deal ,also it made the motor smooth out at the top end as you could see the needle on the tach flutter before we used it . plugs are more even in color from cylinder to cylinder .best run was 10.35 @132 with it on .
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