01-09-2009, 10:30 AM
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Join Date: Jun 2000
Location: Cape Town, South Africa/Mainz, Germany,
Posts: 1,601
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I suggest keeping the length from valve stem to pivot the same and shorten the rocker arm on the pushrod side. That way your rocker arm does not "hang over" the valve tip, creating all sorts of funny loads on the stem or valve tip. Just keep an eye on pushrod to guide clearance.
In theory, you would gain 6.25% in lift and duration (yes, also duration, because it's listed for a given value: .050" from where the valve lifts).
That would also call for a 6.25% harder spring because the force on the lever (rocker arm) has been increased. Also, your valve train geometry would be affected slightly. The pushrods would be a tad too short.
For the Chev SB you can buy the 1.6 ratio to replace the 1.5. I never checked how the new ration has been achieved. My supplier was Scorpion in Florida, but any manufacturer can answer that question.
Dom
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