I am having a problem with my optisparks since I had my motor rebuilt. The torx screws that hold a plate down inside keep breaking. This is the second time it has happened within 4-5 months. Here are the screws I am talking about:

http://mywebpages.comcast.net/orionspl/opticrap.jpg

My only thought is that maybe the dowel pin in the cam is a little too long and it's pushing on that plate and breaking the screws. Any thoughts? Does anyone have a cam from a 96-97 out that could measure this pin for me? I believe they were shorter in the earlier years but I forget which. Any help would be appreciated.

http://mywebpages.comcast.net/orionspl/ssss.jpg

 

I bet that is the problem.Dont know the specs,I have seen them posted here try a search...sorry.Beautiful car btw.

 

Thanks.

 

"On a vented setup, the pin needs to be .620" +-.02" either way, while on a non-vented setup it needs to be .300" with the same tolerances.

 

Ok I measured it and it's coming up at 5/8ths which is .625", I can hardly believe that 5/1000ths of an inch would be causing a problem. But I do see a circular groove on the opti where the dowel pin is rubbing but I would think that it would have been worse.

 

Circular groove, like you can see where the end of the dowel pin is bottoming on the back of the opti drive? It should not do that.

My stock dowel pin was .650" and still was not in danger of bottoming out. I have seen specs that the max dowel pin length was .685".

 

Yes it has definitely made a groove. I have checked and rechecked the measurement and still come up with .625". I assume the best fix is to dremel off some of the dowel pin.