If You use the car mild and never race it, You can close the gap a bit. I
dont have experience with Healeys, but on the Mini, factory clearance is
0.35mms, and on my road cars I used 0.25 without any long term effect.
Bt if You push the car (more power-more heat), You can damage Your valve
seats and valves.
I dont think that there is any measureable power gain from tighter valve
clearance.
Too big gap can damage valve tips/rockers.
2011/6/19 Greg Lemon <glemon@neb.rr.com>
> You get a little more valve lift (like having a slightly hotter cam) if you
> tighten the gap. However, as things heat up and the metal expands you may
> not get the valve to close all the way, and hot gas will get by and burn the
> valve. I have never read anything suggesting you should tighten the
> clearances up for a little more performance, the very limited benefit is no
> doubt not worth the very real risk of the burned valve.
>
> Greg Lemon
>
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