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Old 03-21-2010, 02:36 PM
The Machinist
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Sig Erson 1.6 Roller rockers

I have a set of Sig Erson 1.6:1 roller rockers (trunion and tip) on a set of 461 (Chevy) heads with guide plates and screw in studs. I would like to put these rockers on a set of 883 heads with press in studs without guide plates. My question is, can I put these rollers on the 883 heads without using the guide plates? My thinking is you have to have the guide plates because the roller rockers will not center on their own as ball rockers do. Installing the guide plates will mean installing the screw in studs which is more than I care to do on such a plain Jane set of heads. My other option considered is to order a set of Jeg's 1.6:1 rockers with a roller tip. All opinions welcome on my (as you can see) first posted thread.

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Old 03-21-2010, 03:41 PM
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Based on what you have said the 1.6 rockers are going to give you a very marginal if any HP increase. I would just go with 1.5 rocked if you want to use those 883 heads. You will not notice any difference.

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Old 03-21-2010, 05:02 PM
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You can put these rockers on the 883 heads as long as the factory pushrod guide slots are still in the factory heads and not drilled out. This is what guides the stock rocker arm, just like a guide plate but cast into the head.

You will have to lengthen the slot in the direction toward the stud to use them with the 1.6 ratio, easiest to do using a "Louis Tool". Or you can carefully use a rat tail file or a Dremel, you want to lengthen the slot but not widen it any. The pushrod will interfere with the bottom of the slot due to the fact that they move the pushrod cup in the rocker arm toward the stud to make it 1.6 ratio.
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