GM LS3 with the Hot Cam which boosts HP another 50hp. The LS3 cam specs are intake - 0.551" @ 204, exhaust - 0.525 @ 211. The Hot Cam specs are intake - 0.525 @ 219, exhaust - 0.525 @ 228, 112 LSA Cheapest I could find it is ~$6700, now that's a great deal. No doubt. However I've done the comparison, and here's the rub from a budget perspective comparing to a salvage say LY6 or L92 pull. 1. Purchase ECM flat out = 2x the cost of modding one & most aftermarket one's are locked. 2. Purchase harness flat out, 2-3x the cost of modding one from Speartech. 3. No sensors included, MAF ($250ish), O2 Sensors, etc. 4. $3,700 more then the average L92 pull. 5. $4,500 more then the average LY6 pull. Break even points 1. All accessories have to be purchased. 2. Manifolds most likely swapped to headers 3. Same L92 heads. 4. Swap oil pan = $400 new , or ~$200 used + windage tray & pickup. Pro's. 1. Already has LS3 intake, injectors, fuel rail. = $300+ saved used 2. Already has cam & springs done = $500-$1000 saved. 3. Engine is brand new VS used and a gamble. IF .....I had that kind of cash laying around I'd be right by ya doing it. BUT.....I did one already and it soaked me pretty good for close to $10,000..... Labor, parts, engine ......back then LS1 / 4L60e combo's were going for $6k used. I got mine for $4500 on a sweet deal (only 26K) , but lost my ass on labor and parts. The downside is now the engine salvage yards are trying to give you just the engine instead of the ENTIRE drivetrain pull......trans, harness, ECM. So you have to scour for the complete pulls to save the most cash.