Rick,
I like the cam because of its low cruising rpm, idle is a bit rough, but i like it that way.
The 2V and 4V open chamber heads have been the only heads available here in Germany. Therefore i choosed to install the 2Vs because of their better bottem end torque.
Engine is very quick from 2000 up to 6000 rpm. Nice.
To increase the low compression comming with a stock open chamber set up we decided to install the speedpro pistons with valve reliefs. Result is a compression ratio from about 11:1.
Valve clearence is on the safe side but i don't have the figures in mind right now. Let me check my notes.
All valve spring seats are machined and shimmed to get the same compressed spring hight, +/- 1/10th of a millimeter tolerance.
The rockers are scorpion rollers with 1:1.7 ratio
I think You don't have to be afraid as long as "The Butchers" hints are followed.
The gear problem was caused by my high
oil pressure setting. It was not 114 as i wrote before, it was up to 140 PSI cold!!!
So check your distributor gear with the butchers instructions in hand and don't worry.
If somebody would be interested maybe I would start something like a cobra build-up report pictured more or less completely.
Cheers,
Uwe