LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Optispark drive pin length

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Old Aug 22, 2012 | 10:08 AM
  #1  
Chet1185's Avatar
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Optispark drive pin length

What is the length in inches of a stock 95 lt1 drive pin on the camshaft?

when i bought my car it barely drove so i took it to a dealership to get it fixed. it looks like they drilled out the center of the pin and put a screw in it to make it longer. i just bought a used cam off a guy on this forum and i received it and the pin is a lot shorter than the one the dealership made. on the cam i just got today ( which i was told was out of a 95) it is 5/16 out the front of cam. I need to know what the correct length is and if it is short what can i do?
Old Aug 22, 2012 | 10:31 AM
  #2  
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Re: Optispark drive pin length

Originally Posted by Chet1185
What is the length in inches of a stock 95 lt1 drive pin on the camshaft?

when i bought my car it barely drove so i took it to a dealership to get it fixed. it looks like they drilled out the center of the pin and put a screw in it to make it longer. i just bought a used cam off a guy on this forum and i received it and the pin is a lot shorter than the one the dealership made. on the cam i just got today ( which i was told was out of a 95) it is 5/16 out the front of cam. I need to know what the correct length is and if it is short what can i do?
On a vented setup the pin should be about .700" long (from the face of the cam).

On a non-vented setup the pin is about .300" long. You will have to have the pin pulled out and replaced. Any competent machine shop can do this for you.
Old Aug 22, 2012 | 10:39 AM
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Re: Optispark drive pin length

So im taking it i got the non vented one. Anc thats what was wrong with my engine before, it was a non vented cam with the short pin.
Old Aug 22, 2012 | 11:59 AM
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Re: Optispark drive pin length

4th Gen LT1 F-body Cam Install
Old Aug 22, 2012 | 06:52 PM
  #5  
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Re: Optispark drive pin length

Yeah i read the install section and thats how i noticed it was wrong as soon as i loooked at it. The person is tryin to tell me it came out of a 95.
Old Aug 27, 2012 | 11:02 AM
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Re: Optispark drive pin length

Originally Posted by Chet1185
Yeah i read the install section and thats how i noticed it was wrong as soon as i loooked at it. The person is tryin to tell me it came out of a 95.

^^^ Dont forget to mention you got your money back ASAP lol-- Sorry it didnt work out but i know it ran my vented opti for 77k until i rebuilt motor just recently---very weird---good luck and sorry it didnt work!!
Old Aug 30, 2012 | 01:19 PM
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Re: Optispark drive pin length

yes i did and thank you very much, i appreciate it. did you receive the cam back yet?
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