To do this upgrade - can I simply punch out the OE 88" heads or do I have to buy new cylinders along with everything else (pistons, rings, etc.)?

Aww - never mind, just needed to read on to page 2.

the answer is "YES, the stock 88 can bebored forthe 103"[sm=deadhorse.gif]

 

Not exactly. You can bore it to a 95", but you will have to stroke it to get a 103".

 

You can go upto a 98 on bore only ( GMR/Revolution )
95/98's can produce some very impressive numbers , I've had both a stage IV 95 and now a stage II 103 . Cost wise going up to a 103 from an 88 to me isn't worth it. check out the 98's dynos at http://www.gmrperformance.com/GMRPer...yno_Charts.htm