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Original Message
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| RE: 390 Adjustable Hydraulic Rockers |
| By Big Dave - 01/14/2006 11:19:17 PM; IP 64.72.33.180 |
I spent a whole lot of time on picking a cam for my 390, and one factor was the adjustable rockers. The main problem was that the adjustable rocker arms had a 1.76 lift ratio and the non-adjustable had a 1.73 ratio. So even if you keep the same cam but use different rockers, the performance will be different, the valves will open more and the intake and exhaust duration will both be slightly longer.
I believe (but I'm not 100%) that Comp Cams calculates the specs on a 1.73 ratio and most other popular brands calculate using the 1.76 ratio. you need to look into that before you purchase a cam, as your performance may vary from what they say.
Also, aftermarket rocker (roller rockers, specifically) arms for the FE are all 1.76 ratio, not the 1.73. |
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