98ws6blk

Which would produce the most horsepower/torque on average?

Stock LS6 Heads

OR

LS1 Heads upgraded to a stage 2:
- 5 axis CNC machined
- 2.02”/1.57” Valves

_max_POWER

iTrader: (11)

i couldnt tell you which would produce more power but it seems you would have less money in a good set of stock 243's than the worked over 241/853's

Sales2@Texas-speed

iTrader: (5)

The question is far too vague to make an educated recommendation on. Without knowing all the details on the "LS1 upgraded heads" it is impossible to know. It is possible to kill power and torque by porting heads improperly!

farmington

iTrader: (14)

But if they are CNC'd, wouldn't they have a better chance of being good? I would think that any cnc'd heads would be better than 243's stock.

Sales2@Texas-speed

iTrader: (5)

Some are better than others, but I have witnessed a few sets of CNC ported heads that a student at a university did during a class he was taking....that engine would have been better off with a stock LS6 head! That is not the norm, but it can still be the case.

PREDATOR-Z

I'm sure OP would be able to know if the work was done properly. Let us assume a quality CNC and VJ, like from AI, then YES the LS1s would be much better and produce more power.

3rdCoastPowerSports

iTrader: (5)

stage 2 ls1 heads will get more power and flow a much bigger cam than the stock 243 heads (if ported properly)

HTX

iTrader: (1)

"STAGE 2" doesn't mean anything. We need more details. "CNC" doesn't mean anything either.

anyone can put a head in a cnc machine, butcher it, and call it "stage 2"

Double Aught

iTrader: (5)

Granted, the student probably doesn't have anywhere near the experience in porting heads that some of our sponsors do. I would advise the OP to check out some of the forum sponsors, Advanced Induction comes to mind, to find out if the fully CNC'd 241 v stock 243 would be worth it. I had AI do a custom grind cam and fully reworked 241's for me. I will be posting dyno numbers once the break in period has been reached. That said, I would believe that any professionaly CNC'd 241 would be superior to a factory stock LS6 head. JMHO.

2nd Gen Fl 'bird

iTrader: (13)

Agreed. "Stage" whatever is more of a marketing thing. I wish it would go away. "A" company might sell a stage 1 and "B" company might sell a stage 2 and be the same work. If they explain their different stages, it would clear up a lot.

BadAndy

I'm interested in this comparison as well.

PREDATOR-Z

Stage 1 usually refers to stock valves and stage 2 with 2.02/1.57