Posted: Fri Jun 30, 2006 10:17 pm
Ive finnaly had a chance to inspect several of the engines that had the valves springs shimmed . All are over a year old. One head was staved for oil due to a resticted frame hose. Cams were shot but showed no damage from actual wear. Just heat. Valves springs were tested and still passed the same load test as when installed.
Head 2 was in a mx stroker engine for the last year. Cams looked like brand new. Valve clearances were perfect.
Head 3 was the orignal first shimmed head from 2 years ago. Cams still looked like the day were new. The cams are from Sandstorms original Cannibal . Well over 300 hours. That engine also went through a crank failure. The head was removed for replacement with a ported head with prototype camshafts.
I will post pics of those soon.
Most all valve springs can be shimmed with a .030" shim to bring them to above 40punds load test . I have only seen a select handfull on used or new valve springs ever pass a load test.
The cam bucket bores have been honed out on the younger heads but the older one was not but I suspect they have good clearance.
Head 2 was in a mx stroker engine for the last year. Cams looked like brand new. Valve clearances were perfect.
Head 3 was the orignal first shimmed head from 2 years ago. Cams still looked like the day were new. The cams are from Sandstorms original Cannibal . Well over 300 hours. That engine also went through a crank failure. The head was removed for replacement with a ported head with prototype camshafts.
I will post pics of those soon.
Most all valve springs can be shimmed with a .030" shim to bring them to above 40punds load test . I have only seen a select handfull on used or new valve springs ever pass a load test.
The cam bucket bores have been honed out on the younger heads but the older one was not but I suspect they have good clearance.