since you already have a cam you are probaly going with 1.6 ratio. all i had to do with 1.6's was remove the baffle on the passengers side valve cover. i think if you were to run 1.7 ratio your would have to grind the first 3 structural supports on each vavle cover.
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NewEngland Auto www.baystategearheads.com
-91 Mustang Coupe, ex 4cyl (sold)
-99 F150, 3" lift, 35" Procomps, Magnaflow exhaust
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