chevellepst

Hey guys got a pretty simple question, I've got a 98 ws6 trans am with 806 heads on it, I got my hands on a set of 243 heads with all the parts I need to swap them(valve covers etc etc) my question is this, aside from being the better center bolt covers and flowing a little better is the swap worth it? And if I do the swap how far off is my tune going to be? I'm assuming the car will still be drive able until I can get it tuned?

Rise of the Phoenix

iTrader: (27)

The 243 heads are an improvement over the 806 castings, which means they are going to introduce more air into the engine, which means you're going to need a tune to compensate for the increased airflow. Can you get by without a tune, probably so, but I wouldn't want to chance it. Also, if you're going to pull the heads you might as well do a cam swap while you're at it. A cam swap is going to yield far greater gains than just swapping the heads. Doing both will make the car feel like another animal.

HCI2000SS

iTrader: (2)

If you drive it straight to the tuner and take it super easy you should be ok, but it definitely will need tuning

Jtm2085

iTrader: (1)

I and several others have ran ls6 crate motors on a stock ls1 tune with no issues.

chevellepst

I realize what your saying about the increased airflow I was just curious how far off the tune would be and whether or not it would be drive able but now that I think about it I'll just save for a cam and headers and do everything at the same time.

Rise of the Phoenix

iTrader: (27)

That makes the most sense. Do it all at once and then pay once for a tune.

MonmouthCtyLS7

iTrader: (6)

I personally would have them worked over a bit before going through a head swap but some people are different. Stock the gain should be somewhere around 10-15 hp I would assume.

Rise of the Phoenix

iTrader: (27)

I agree with you on that too, but if he does a cam swap, puts on a good set of headers and a better exhaust, the 243's, even in stock form, will pick up a great deal over what he has now. If you have the means, send them to AI for there 232cc CNC program.