Originally Posted by cobalt327
Thanks. What does the "89" mean in the "Summit headers 89"?
I'm guessing "89" is the cost.
Originally Posted by ap72
Aren't those retainers and locks for a 8mm valve? The springs could work but I don't think the retainers and locks will.
My take on the retainers is that, yes- they are used w/8mm valves. But as long as the ID of the retainer (where the locks sit) is the same as the retainer for the 11/32" valve (we know they're both 7º), the retainers will work fine- provided you use the 11/32" locks and not try to use the 8mm locks.
This question also came up in THIS
thread, although it was never really answered. But if my theory isn't correct, Spin would have surely dropped valves by now- provided that he has actually run this engine.