Just picked up a '98 T/A and was wondering if there were any problems with the '98 model motors. I know that the wiring, PCM and heads are different than the 99+. Would it be beneficial to me to put a set of 99+ heads on the car and upgrade the harness/PCM to 99+ as well?

 

No,
No (if you are upgrading your heads maybe but you will need new valve covers.)

No

 

No u shouldn't , if your gonna upgrade then do aftermarket set ups, But the 98s are ok from what I hear. I also have a T\A mines an 00".

 

buddy of mine had a 98 SS, sold it to someone on here I believe, but he had no problems as far as I know..yea the 98's have the perimeter bolts on the valve covers while 99's and up have center bolts...GM performance parts has some really NICE covers if ur lookin for something different

 

If you are going to put new heads on your ride on an extreme budget, go with patriot LS6 heads for under $500. 20-30rwhp right there. And no a newer PCM will not get you any power