Ls1 vs ls6 heads
07-28-2012, 10:48 PM
#21
The 243/799 castings are superior in flow and overall design, and gains when swapping a stock LS1 head for a stock 243/799 head usually nets you somewhere in the neighborhood of an additional 15rwhp.
07-28-2012, 11:17 PM
#23
Any metal you remove from the combustion chambers will lower the compression ratio. Easy to get it back with milling, though.
Be aware it's very easy to create imbalances in airflow if you get crazy with the hand-porting. I only recommend polishing to remove the casting roughness in the ports for non-professionals (like myself). And flush 'n brush them thoroughly afterward to get all the abrasives and aluminum dust completely gone.
Leave the carbide burr to the pros who know what they're doing and can get all 16 ports to reasonably symmetrical volumes and airflows.
Be aware it's very easy to create imbalances in airflow if you get crazy with the hand-porting. I only recommend polishing to remove the casting roughness in the ports for non-professionals (like myself). And flush 'n brush them thoroughly afterward to get all the abrasives and aluminum dust completely gone.
Leave the carbide burr to the pros who know what they're doing and can get all 16 ports to reasonably symmetrical volumes and airflows.
... I hear thoses are more expensive right? 
07-29-2012, 09:10 AM
#30
In fact they are:
LS6: The Ruthless Pursuit of Power
LS6: The Ruthless Pursuit of Power
The LS1 exhaust port was also revised with the same goals: improve short turn radius and make cross-sectional area more consistent. The port exits were also given the pronounced D-shape that many racing cylinder heads use. The changes to the exhaust ports netted about a 10% improvement in high lift flow.
07-29-2012, 01:42 PM
#37
I took off the 806s but did get tuned yet im waiting til im done with everything... I also like at the heads more closesly there is major differences vavles are way diff and so on.. I tried putting my 36# injectors in with no tune,lol doesnt work.. Now since I spun that lifter m trying to see if im goin to roll with the lifters I dont need a tray or ls7s with the ls2 tray so im kinda stuck
07-29-2012, 02:18 PM
#39
If you're asking that question, it's time for more reading and less posting.
All factory LS6 heads were 243 castings, but not all used 243 heads came from LS6 engines.
The OP was asking about heads that came off an LS6 engine.
All factory LS6 heads were 243 castings, but not all used 243 heads came from LS6 engines.
The OP was asking about heads that came off an LS6 engine.
07-29-2012, 05:03 PM
#40
If you're asking that question, it's time for more reading and less posting.
All factory LS6 heads were 243 castings, but not all used 243 heads came from LS6 engines.
The OP was asking about heads that came off an LS6 engine.
All factory LS6 heads were 243 castings, but not all used 243 heads came from LS6 engines.
The OP was asking about heads that came off an LS6 engine.