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Discussion Starter #1
Hello,

I need to know the correct rocker arm ratio for a 1990 2.5 liter TBI. The machinist who port/polished the intake/exhaust manifolds and head is working on a custom grind for the cam. I do not know the correct rocker arm ratio for the stock rockers.

I have read where they are claimed to be 1.55, 1.56, 1.7 and 1.76; I didn't think they would be more than mid 1.4's but then again, I don't know.

Also, if you know of a place to look, I am happy to do that but thus far my searches have proven inconclusive. :( :facepalm:
 

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When all the dust settled, the rocker arm ratio for the 1990, 2.5 liter TBI (non-turbo) 8 valve engine is 1.71:1 (this is an average value).
 
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