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Old 01-12-2011, 01:52 PM
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Default rocker selection
i have the ms4 cam and am lookin into getting prc227 heads, wondering what would be the best ratio for rockers to make power and what brand for strength, what does eveyone like? feed back will be apreceated, thank you!
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Old 01-12-2011, 02:21 PM
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Stock rockers are fine.
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Old 01-12-2011, 02:23 PM
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whats the stock rocker ratio?
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Old 01-12-2011, 04:41 PM
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1.7:1
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Old 01-12-2011, 05:23 PM
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I'm liking the Yella Terra 6646. 1.8, lightened nose, full needle bearings, joined shaft and it is supposed to fit under stock covers.

transmarobird91, what car do you have? Fourth gen? 91? No sig....
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Old 01-12-2011, 05:26 PM
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ya i got a 98 ws6
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Old 01-12-2011, 08:49 PM
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I'm not a fan of running larger ratio rocker arms. there really isn't any point in them with a cam like the MS4 (on stock heads). I'm not sure what the new heads are going to flow, but I would stick with stock ratio if it were me.
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Old 01-12-2011, 09:14 PM
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You should check out Texas Speeds upgraded stock rockers. Definetly some nice pieces, and the price is nice as well.
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Old 01-12-2011, 09:48 PM
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The 1.7 Yella Terra rocker arms would be YT6645. Better than stock with the bearing & trunion kit.
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Old 01-12-2011, 10:32 PM
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whats the difference in ratio between 1.7.1 and just 1.7 i understand 171 is stock ratio and id rather run different roller rockers rather than stock..
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Old 01-13-2011, 08:32 AM
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1.7 = 1.7:1 meaning the ratio of valve lift to lobe lift on the cam is 1.7":1". multiply lobe lift by rocker ratio to yield valve lift.
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Old 01-13-2011, 11:37 AM
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i failed math multiple times lol
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Old 01-13-2011, 11:54 AM
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look on your cam specs for your lift. for instance, the torquer v2 is .598/.595. That is on a stock 1.7:1 rocker arm ratio. If you wanted to jump to a 1.8:1 ratio, your lift would change by the difference. To calculate it take the lift/1.7*1.8

.595/1.7=.35
.35*1.8 = .630

The MS4 already has such a high lift that I don't think there would be any benefit from a larger rocker ratio.
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Old 01-13-2011, 11:57 AM
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okie dokie ill go with some aftermarket 1.7 rollers then. thanks for the help guy
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