[TR] TR4A CAM/VALVE Timing

[Arnold S. Gilmour]

Hello All, John is the former owner  and frequent driver of my TR4A. I
purchased the car from him in 1979.
 Have tried to get him to join the
list., to no avail.  I am on the digest and will forward responses to him or
you can
contact him directly.
Has anyone knowledge of changing the
cam/valve timing from factory settings?
We are working on a TR4 which
has recently had it's engine rebuilt.  We used a
new "D" grind cam and
slight big bore kit.  The compression is reading
right on 205 PSI on all
cylinders.  We used Total Seal Piston Rings, so that also
adds to the extra
high compression.
Wondering if anyone has direct experience with
retarding the cam timing 
to change the performance characteristics, and
hopefully reduce the effective compression
to some level where the spark
knock and dieseling will subside?
Can anyone refer us to someone who
does have this knowledge? 
Sincerely,  Arnold S Gilmour
Thanks
for any info.
John Lestina
jdlestina at mindspring.com