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Old 10-12-2007, 09:16 PM
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1.6 rockers

I,m currently running performer rpm heads 64 chambers with 170cc runners 1.5 rockers. The matching cam has at .50 234/244 with .488/.510 lift. My question will 1.6 rockers give me any more horsepower or should I keep saving for those pro 1 dart or AFR heads. thanks for any help.

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Old 10-12-2007, 09:50 PM
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yes they will
I used 1:65s on the intake side
but they wont give you a real lot of horsepower
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Old 10-12-2007, 11:02 PM
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Be sure to check if you will not have spring bind using a 1.6 ratio, verses a 1.5 ratio. I had that once, and had to use high-rev lifters and change my gear ratio, to compensate.
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Old 10-13-2007, 07:33 AM
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The gain will vary by application of course, but I know on a stock LT1 that a switch to 1.6 rockers and LT4 springs is good for an honest 12-15 HP. It increases lift by around .030"~. And as carsavvy stated, make sure your springs can handle it. As well as checking for coil bind, make sure it won't exceed the overall lift recommendations for your current springs either. You'll need to know the current installed height to compute that.
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