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Flow #s for Stock Heads?

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Old 08-23-2003, 05:53 PM
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Default Flow #s for Stock Heads?

Just for informational value. Can someone post the specs and flow #s of the stock LS1 heads.(i.e. valve sizes, rocker sizes, flow #s) Thanks
Old 08-23-2003, 06:10 PM
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Default Re: Flow #s for Stock Heads?

Here are the stock LS1 head flow numbers:

Lift: .200 .300 .350 .400 .450 .500 .550 .600
137 187 207 223 228 237 242 243

Old 08-23-2003, 06:16 PM
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Default Re: Flow #s for Stock Heads?

Forgot to add the valve size and rocker size

rockers: 1.7:1
valve size: 2.00 and 1.55
Old 08-23-2003, 06:31 PM
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Default Re: Flow #s for Stock Heads?

Thanks malibu350!
Old 08-23-2003, 08:44 PM
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Default Re: Flow #s for Stock Heads?

Jason from thunder has a print out from there superflow bench, he has it in a few of his posts do a search under his name and you will see what all the heads flow
Old 08-23-2003, 10:58 PM
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Default Re: Flow #s for Stock Heads?

I think this is the info you are looking for...

Stock LS1 Head:



Stock LS6 Head:
Old 08-24-2003, 02:53 AM
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Default Re: Flow #s for Stock Heads?

Seems like a lot of flow for stock heads, is 20-25hp really worth $2000+ i wonder? I think I'll work with the stock for now........
Old 08-24-2003, 02:58 AM
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Default Re: Flow #s for Stock Heads?

More like 2900 for MTI S2 heads. And yes it is worth it. Everything works as a system. When I tuned and put 100 wet shot on I got 135rwhp with it! Better you breath, the faster you will run Not bad numbers for A4,12-bolt and all. And Tuned safely!
Old 08-24-2003, 02:41 PM
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Default Re: Flow #s for Stock Heads?

The LS6 heads will not show much gain with your stock LS1 cam. Now its a different story if you decide to drop a nice cam in it, then the stock LS6 heads will show their stuff. Now you are ready to get them ported later for even more hp.




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