I have a 98 camaro ls1 m6. Do i need to change my pcm to a 99 or newer if i want to tune for cam or build motor etc.?!?!?! Thanks aj

 

You don't have to but we would highly suggest that you do so. We did a bit of a write up on this a long time ago.
http://www.efialchemy.com/db/02to97pcm/02to97PCM.html

 

The 99+ is definately a better choice. However, I have not had any issues using a 98 PCM to control my H/C LS6.

98 PCM uses the back-up VE table for AutoVE. The back-up table columns are scaled every 10 KPa MAP. So, you have to fill in the 5 KPa columns on the Main VE table by estimating the value between columns. PE fueling has not been an issue.

 

99 and 00 also have secondary VE, but they can be updated with a new OS.

For a radical setup or forced induction. Definitely go with a newer PCM. You'll be OK with heads and cam though.

 

I asked the same question before purchasing my car. Most people said I would not have any problems with tuning the 98 PCM. I do know that there are some restrictions to the 98's but I think that is for FI setups.

 

IF I had a 98 corvette, I would switch regardless. On my 98 f-car, I switched, and then switched back, since I did not like the wiring harness mess with the pinout arrangement.

Ryan