With all the good advice on rebuilding my 1.8L, the best was: Research, research. After selecting a crank from Demello, I turned my attention to camshafts and on the Elgin website there is an obscure reference to Rocker Ratios, but they differ from Intake to Exhaust! Who knew? I verified this with measurements and found that they are different, and what a difference it could make if they were mixed up!

My rockers measure out at a 1 : 1.32 Exhaust and a 1 : 1.39 Intake.

Thanks to all for the advise and especially the suggestion for researching everything (could've been Jake).

ScottD

.................I am intrested in how you determined the ratios. The method by which intake and exhaust was measured.......MM.

Its a well known fact that the intake and exhaust rockers have different ratios..

You CANNOT mix up intake and exhaust rocker arms, this is due to the offset of the rocker in relationship to the pushrod cup and the valve adjuster.

.................Yes...(from above)... But I,m still curious how he went about the process,and measurements that were taken/made.MM.

To determine ratio, I simply measured with my vernier calipers from center of the pivot point to the center of each side. ie valve side and push rod side. Then it's just dividing one into the other. Interesting that this critical item is not mentioned in the few rebuild books I have purchased. Those rocker assembles fall apart easily and a "newbie" like me might never know the difference until startup and the engine runs a little funny.

It is impossible to install an intake rocker on the exhaust valve and vice versa.. They are not even close to aligning.

Good to know, thanks Jake.

ScottD