[Fot] Oversize lifter bore

[Larry Young]

Chip, could you explain this?  How does a larger diameter lifter change 
the valve timing?

For the TR3/4 I've found that 99% of the available cams are designed 
using the lowest common denominator for lifters.  In the US, the 
smallest common lifter is the SBC at 0.842.  I've often wondered whether 
some of these grinds find their way into Spitfire and TR6 engines with 
the 0.800 lifter.  The result would be a cam that would run off the edge 
of the lifter. One can always get more lift by using a cam designed for 
a larger lifter.
Larry Young

On 2/4/2011 6:45 PM, Chip Collingwood wrote:
> This mod will open and close the valve sooner but will
> not effect maximum lift...