Last modified - 04/15/06
In technical articles MGB16, MGB24, and MGB26 we have discussed at the length the complexity of the variances in valve train geometry. If you have not already done so, I suggest that you read these for a better understanding.
Along with the Harland Sharp 1.55:1 roller rocker kit that we have supplied you, we have enclosed 8 lightweight valve springs to pre-assemble to your exhaust and intake valves. Adopting this method of approach has several advantages, these are as follows:
Since, you will be using your original rocker pedestals, we highly recommend that they are machined .025” on both sides of the pedestal before carrying out the above.
NOTE: It is extremely important that aluminum spacers are used between the rocker arms. Simply retaining the OEM spring spacers is unacceptable. Ignoring this advice will lead to the hardened steel roller wearing into the roller aluminum supports.
Pushrod contact should be checked at valve closed, valve full lift and back to the valve closed again cycle.
Excessive elongation of these cylinder head guide holes should be avoided. This is especially true with aluminum cylinder heads, where break through into the coolant passage may occur.