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Old 05-18-2009, 06:01 PM
Curtis
 

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Roller rocker problem

I have a small block 400 with the stock crank with 6" rods. It has been bored 30 over and has been lined bored. It is a complete roller motor. I bolted a set of world heads on the block and begin to adjust the valves. The problem is the throat of the crane roller rockers hit the valve retaining ring before the valve gets adjusted. I called jegs and they said that I have the correct set of roller rockers ---- does anyone know what is wrong

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Old 05-18-2009, 06:14 PM
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Pushrods too short?
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Old 05-18-2009, 06:18 PM
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Pushrod length may be incorrect, have you checked your rocker geometry?
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Old 05-18-2009, 07:22 PM
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That is what I figured the problem was---- But I got confused when a well respected hot rodder friend stated that I had to have special rockers for a set of world heads--- and I never heard of that. Do I need to get a push rod length checker and check the geometry out.

I don't understand why the push rod length would be different than stock because the heads seem to be the same height as the stock ones
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Old 05-18-2009, 07:34 PM
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Do these heads have .100" longer valves? What World head is it? Longer valves are common in aftermarket heads.
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Old 05-18-2009, 07:57 PM
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world sportsman heads bought from jegs
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Old 05-18-2009, 08:16 PM
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If these were purchased assembled for use with a solid lifter, hydraulic roller, or a solid roller then they will have +.100" longer valves to accommodate the larger, taller valve spring. Did they have a -1 or a -2 at the end of the part #? The -2 has longer than stock valves.
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Old 05-18-2009, 08:59 PM
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it has a two at the end
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Old 05-18-2009, 09:16 PM
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Time to check your goemetry so you can order the correct pushrods.
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Old 05-19-2009, 12:35 PM
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Quote:
Originally Posted by Curtis Thornton
That is what I figured the problem was---- But I got confused when a well respected hot rodder friend stated that I had to have special rockers for a set of world heads--- and I never heard of that. Do I need to get a push rod length checker and check the geometry out.

I don't understand why the push rod length would be different than stock because the heads seem to be the same height as the stock ones
This is not unusual, often the rocker needs to be clearanced to miss the retainer. A high speed die grinder or Dremel tool with as fine a stone as you can get, relieve the offending area to provide a minimum of .050 inch clearance. Polish your work so as not to create any stress risers that can foster crack formation.

Be sure to get your push rod lengths correct for the proper sweep on the valve stem, directions are on the Comp site in technical help. check your clearances thru the entire sweep of the rocker for slot to stud, rocker to retainer, spring coil to coil, retainer to top of guide or seal, sweep on the stem, push rod to guide or clearance hole. If using a self guided rocker, guide edges to retainer. .050 inch is a good minimum for all of these.

Bogie
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Old 05-19-2009, 12:44 PM
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Quote:
Originally Posted by ericnova72
Time to check your goemetry so you can order the correct pushrods.
Good catch!
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