Conversions & Swaps - L33 5.3 na performance build recipe - first, there are many ways to do this, na, boost, different cam and heads, so on. but this one has worked for me. my l33/243 longblock with 8k miles was 600.00. 12k mile oem ls2 cam and springs 150.00, ls6 intake 300.00, ebay .080 pushrods 85.00, arp rod...