padgett Posted June 17, 2010 Share Posted June 17, 2010 Thought I had but cannot find. Does anyone have the cam specs (lift, duration, etc) for the faacory cam in 88, 89, and 90 3800 (know 88 is different, not sure about 90) ? Link to comment Share on other sites More sharing options...
2seater Posted June 18, 2010 Share Posted June 18, 2010 I am pretty certain of this data, derived from installing an '88 and '90 cam in my spare engine and degreeing the cam. I am not certain, but I believe the '89 cam is the same as '90, since the lift and duration matches old data I have from the rebuilt '89 engine I have in the car now:1988: Intake and exhaust lobe lift .271", Intake and exhaust duration 192-193 deg. @ .050" lift. Lobe separation 112.5 deg., 109 deg intake centerline.1990: Lobe lift; intake .251", exhaust .255, Duration @ .050", intake 187deg, exhaust 189.5deg; Lobe separation 115.5, intake centerline 113 deg.These are both used cams but I ran the same numbers using #6 cylinder as the baseline (the other end of the cam), and all of the numbers were generally within 1 deg. of the same and lift within .002". Link to comment Share on other sites More sharing options...
padgett Posted June 18, 2010 Author Share Posted June 18, 2010 AFAIR the rocker arm ratio is 1.6. Is that correct ? Link to comment Share on other sites More sharing options...
2seater Posted June 19, 2010 Share Posted June 19, 2010 I believe that is correct. Everything I have found says that the ratio is 1.6:1 Link to comment Share on other sites More sharing options...
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