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5.7 vs 6.1 cylinder heads?

Old 01-20-2007, 08:02 PM
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Default 5.7 vs 6.1 cylinder heads?

What's the differences between the heads, are they interchangeable?
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Old 01-21-2007, 07:22 PM
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I know they are interchangeable i changed my 5.7 heads to 6.1 heads. i know the 6.1 heads are higher compression. they flow better as well.
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Old 01-21-2007, 09:47 PM
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Yes they will interchange. The 6.1 has bigger valves and flow more. They also have a smaller chamber so they increase compression on a 5.7. I wouldn't run the stock 6.1 heads on a stock 5.7 without an aftermarket controller to reduce timing. The HEMI Shop has a "big chamber" CNC head that is great for use on the 5.7.
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Old 01-22-2007, 09:09 AM
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Good deal, I like options
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Old 01-22-2007, 11:11 PM
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The 6.1 will flow more CFM, but the 5.7 will have more air speed velocity.
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Old 01-27-2007, 11:00 PM
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Under 400 cu inch I'll take a ported 5.7 head over a 6.1 head any day.
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Old 01-28-2007, 12:58 PM
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Ported with stock valves, or bigger? I've got my eyes set on building a stroker motor at some point, and need to get my ducks in a row before I start chunking down cash
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Old 02-12-2007, 12:16 AM
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I used 5.7 heads with 2.08" int and 1.62" exh. on my 6.1 stroked 392. I guess you could call it reversed engineering.
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Old 03-16-2007, 05:40 AM
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any flow numbers for both?
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Old 03-22-2007, 10:51 PM
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Originally Posted by 1dirtyZ
any flow numbers for both?
http://www.thehemi.com/57L/flow.php
http://www.thehemi.com/61L/flow.php
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