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Car Forum / Ford / Ford Mustang / September 20051.7 Roller Rocker Q
I have an '89 5.0 5-speed and a set of real '93 Cobra 1.7 roller rockers. As I understand it, there are two ways to install these ... with the shims under them and without. Any advice on which is the RIGHT way for my engine? Thanks! Dave > I have an '89 5.0 5-speed and a set of real '93 Cobra 1.7 roller rockers. > As I understand it, there are two ways to install these ... with the shims [quoted text clipped - 4 lines] > Thanks! > Dave Depends on your engine, each is a little different. You won't know until you start to install them. Go to the Comp Cams or Crane Cams web site, and look through the FAQ/Technical section. You'll find detailed instructions on how to install hydraulic cam rocker arms. The difference is that instead of turning the bolt to set pre-load, you'll need to add or remove shims. A lot more time consuming with pedestal mounts, but not overly difficult. And it's essential that you get this right of you want things to work correctly.  Signature.boB 1997 HD FXDWG - Turbocharged! 2001 Dodge Dakota QC 5.9/4x4/3.92 1966 Mustang Coupe - Daily Driver 1965 FFR Cobra - Finally on the Road! > I have an '89 5.0 5-speed and a set of real '93 Cobra 1.7 roller rockers. > As I understand it, there are two ways to install these ... with the shims > under them and without. > > Any advice on which is the RIGHT way for my engine? Whether you need to install shims depends on the tolerance of each pedestal and valve combination. I had to use shims on most of my rockers. Just read up on the installation instructions. It isn't too difficult. Dave, We put a set of 1.7s on a stock '87/auto project coupe a while back...no seat of the pants difference. An Explorer GT40, Y303 heads and FoMoCo shortys and the car started to come alive. A 2500 stall speed converter, 4.10s and a wide ratio conversion had the car running 13.40s. While the project was to see what a SD will take with mostly spare parts on hand, it shows that you've got to come up with a system. FWIW, Five sets of heads on four engines haven't required shims for correct geometry bradtx
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