i have an ls2 from a corvette and found a good deal on a set of PRC 225 as cast heads to replace the 243s. Well after a few beers and a late night i ended up buying a vortech supper charger kit. On TSP website they say

• Small Bore Configurations for extra compression applications while keeping good piston to valve clearance
• Large Bore Configurations for customers looking for bigger bores such as stroke or boost applications

Can I use these heads in stock NA form or should I leave the 243s and just change the springs?

.................No more beer and credit cards

 

We see these PRC heads from TSP come in a 62cc or 68cc combustion chamber. Either of these would have compression to high for you're boosted application. We would recommend AFR-1630 heads. These have 72cc chambers and 230cc intake runners. The 72cc chamber would get your compression down around 10.1:1.