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Ls1 vs ls6 heads

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Old Jul 28, 2012 | 05:50 PM
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Question Ls1 vs ls6 heads
How much more do the ls6 heads flow over Ls1... I put my ls6 head next to my Ls1 and it seems intake and exaust holes are the same size?? So whats the diff.??
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Old Jul 28, 2012 | 05:56 PM
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many many differences..........the LS6 exhaust ports are D shaped for 1............
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Old Jul 28, 2012 | 06:01 PM
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LOL, about 40 hp.
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Old Jul 28, 2012 | 06:19 PM
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Really 40 HP? Ok... Well looks like ill be porting my ls6 heads while there off
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Old Jul 28, 2012 | 06:30 PM
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Ls1 makes about 300 to the wheels

Ls6 about 360 to the wheels.

Heads are at least 35hp of that number.
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Old Jul 28, 2012 | 06:35 PM
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Originally Posted by FASTFATBOY
LOL, about 40 hp.
Originally Posted by FASTFATBOY
Ls1 makes about 300 to the wheels

Ls6 about 360 to the wheels.

Heads are at least 35hp of that number.
BS & more BS.

Correct answer: 10% more flow per every chart I have seen here.
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Old Jul 28, 2012 | 06:49 PM
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Originally Posted by Felix C
BS & more BS.

Correct answer: 10% more flow per every chart I have seen here.

10% how many more pony power would that be over stock
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Old Jul 28, 2012 | 07:45 PM
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Originally Posted by Felix C
BS & more BS.

Correct answer: 10% more flow per every chart I have seen here.
Ok, so where does the power difference come from LS1 vs LS6?

My stock LS6 makes 385 to the wheels with mild bolt ons and exhaust through a six speed.

Both stick cars:

LS1 300 to the wheels

LS6 355 or so to the wheels

55RWhp difference, which is about 80 at the flywheel.


Auto car:
https://ls1tech.com/forums/dynamomet...only-dyno.html

Pat G says about 25rwhp, about 35 ish at the flywheel.
https://ls1tech.com/forums/dynamomet...-increase.html

If you take the time to do a GOOD valvejob and mill the heads to get 11 to 1 compression even more power is there.
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Old Jul 28, 2012 | 07:48 PM
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Question was about flow nos. Nothing more. Actual answer in terms of gain on a stock LS1 is 15rwhp.

Whatever personal experience you provided is from an LS6 engine. Entire package.
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Old Jul 28, 2012 | 07:59 PM
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Your the man, carry on.
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Old Jul 28, 2012 | 08:04 PM
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Cold hard facts. That is all.
Last edited by Felix C; Jul 29, 2012 at 06:07 AM.
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Old Jul 28, 2012 | 08:06 PM
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Thanks both you guys for info all I can get helps
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Old Jul 28, 2012 | 08:19 PM
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So will,porting and polishing my heads change my compression? If so lower or higher
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Old Jul 28, 2012 | 08:33 PM
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Ls1 heads 230 cfm ls6 260 cfm. Correct me if I'm wrong.
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Old Jul 28, 2012 | 08:35 PM
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Originally Posted by chevybayboy
So will,porting and polishing my heads change my compression? If so lower or higher
No. Porting will increase flow. Milling the heads will increase compression.
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Old Jul 28, 2012 | 08:41 PM
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Originally Posted by Theblacknightls1
No. Porting will increase flow. Milling the heads will increase compression.
Ok cool thanks
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Old Jul 28, 2012 | 08:49 PM
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Some good info here to read...

http://www.c5registry.com/documents/ls6/page2.htm
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Old Jul 28, 2012 | 09:22 PM
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Originally Posted by Mike Morris
That was def. A nice piece of info
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Old Jul 28, 2012 | 09:45 PM
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Originally Posted by chevybayboy
So will,porting and polishing my heads change my compression? If so lower or higher
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.
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Old Jul 28, 2012 | 09:50 PM
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I'll tell you soon I just took my 806 heads off today and the 243's gone in this week
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