LS6 Heads
#3
Are there any power gains on using the LS6 heads on a LS1 engine ? I have a LS6 intake and a LG cam , 600/610 and about 240 duration with a comp cams double spring kit pushrods and a trunnion kit.
#4
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Yeah...get those heads ported and you'll gain 20-40hp. Exactly what Im in the process of doing right now.
#5
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Here are the differences between the heads:
LS1 head (853 or 241 casting number)
Combustion Chamber Vol. : 66.67 cc
Compression Ratio : 10.1:1
Intake Port Vol. : 200 cc
Exhaust Port Vol. : 70 cc
Intake/Exhaust Valve : 2.00/1.55 inches
LS6/2 head (243 or 799 casting number)
Combustion Chamber Vol. : 64.45 cc
Compression Ratio : 10.5:1
Intake Port Vol. : 210 cc
Exhaust Port Vol. : 75 cc
Intake/Exhaust Valve : 2.00/1.55 inches
FWIW, LS6 heads with 243 casting number that came in the Corvette C5 Z06 had lighweight hollow stem intake valves and sodium filled exhaust valves with revised valve springs to match the LS6 cam's increased lift.
Last edited by R6cowboy; 03-05-2015 at 07:52 AM.
#6
Absolutely, especially ported and with a valve job LS6 heads can make impressive power, but that could be said regarding any LS head really. Basically the LS6 heads are a step up from LS1 heads.
Here are the differences between the heads:
LS1 head (853 or 241 casting number)
Combustion Chamber Vol. : 66.67 cc
Compression Ratio : 10.1:1
Intake Port Vol. : 200 cc
Exhaust Port Vol. : 70 cc
Intake/Exhaust Valve : 2.00/1.55 inches
LS6/2 head (243 or 799 casting number)
Combustion Chamber Vol. : 64.45 cc
Compression Ratio : 10.5:1
Intake Port Vol. : 210 cc
Exhaust Port Vol. : 75 cc
Intake/Exhaust Valve : 2.00/1.55 inches
FWIW, LS6 heads with 243 casting number that came in the Corvette C5 Z06 had lighweight hollow stem intake valves and sodium filled exhaust valves with revised valve springs to match the LS6 cam's increased lift.
Here are the differences between the heads:
LS1 head (853 or 241 casting number)
Combustion Chamber Vol. : 66.67 cc
Compression Ratio : 10.1:1
Intake Port Vol. : 200 cc
Exhaust Port Vol. : 70 cc
Intake/Exhaust Valve : 2.00/1.55 inches
LS6/2 head (243 or 799 casting number)
Combustion Chamber Vol. : 64.45 cc
Compression Ratio : 10.5:1
Intake Port Vol. : 210 cc
Exhaust Port Vol. : 75 cc
Intake/Exhaust Valve : 2.00/1.55 inches
FWIW, LS6 heads with 243 casting number that came in the Corvette C5 Z06 had lighweight hollow stem intake valves and sodium filled exhaust valves with revised valve springs to match the LS6 cam's increased lift.
#7
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Yes. Anything that will work on LS1 heads will work on LS6 heads. The head castings themselves are exactly the same, the only differences are the shapes of the combustion chambers, intake and exhaust runners. All hardware/valvetrain components are interchangable between the heads.
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#8
Yes. Anything that will work on LS1 heads will work on LS6 heads. The head castings themselves are exactly the same, the only differences are the shapes of the combustion chambers, intake and exhaust runners. All hardware/valvetrain components are interchangable between the heads.
#9
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ls1 valve springs are the weakspot on factory engine. bare min upgrade springs to ls6 , i wish i had better than ls6. my factory ls1 springs at 50k milage floated / fluttered at 5800 rpm. my ls6 springs with my ls6 cam (only 550 lift) never miss a heartbeat knock on wood! cheers.
#13
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I think TSP was comparing their stage 1 ported 243s vs factory 243s, a 20whp increase on otherwise stock LS1 engine would be save to say. That makes sense. Also, I agree you're about right regarding factory 243s are worth about 20 some hp over factory 241s on an otherwise stock LS1.
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im remembering from back in 2006 when i added heads. i believe that number was if i just added those heads to my stock 99 motor with stock cam. a better cam can take more advantage of better flowing heads.