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Compression ratio?

   
Old Dec 18, 2012 | 07:44 AM
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Default Compression ratio?
Stock 4.8 with a set of ls1 241 heads, what kind of compression am I looking at?

Thanks folks!
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Old Dec 18, 2012 | 08:46 AM
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Way low 8.84:1
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Old Dec 18, 2012 | 09:32 AM
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Wow, I wouldn't have thought that with the factory flat tops! I prolly built a big cool sounding "pig" ha ha
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Old Dec 18, 2012 | 10:39 AM
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Yeh the 41's have a bigger chamber, intake valves then the 4.8 heads. Other then that they are the same.
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Old Dec 18, 2012 | 10:49 AM
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61cc compared to 66.7cc combustion chamber is where the compression is lost. I've seen lots of guy install LS1 heads on 5.3's like its some magical power adder....and end up loosing a ton of power.
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Old Dec 18, 2012 | 11:06 AM
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They do have bigger valves though. I had some 243's but didn't wanna use them on this build. It's a pretty big charger. 80mm inducer and a 86m exducer.
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Old Dec 18, 2012 | 11:15 AM
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5.3/4.8 heads are good heads, after you have 2" intake valves installed.
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Old Dec 18, 2012 | 11:27 AM
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The heads are fine the way they are LOL. Unless you are dead set on diff intake valves. Howmany people going in the 11-10's with stock heads? Quite a bit
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Old Dec 18, 2012 | 11:35 AM
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Originally Posted by Mangled03gmc
The heads are fine the way they are LOL. Unless you are dead set on diff intake valves. Howmany people going in the 11-10's with stock heads? Quite a bit
Correct they are fine the way they are, the run a engine perfectly fine. Like anything else though there is lots of room for improvement.
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Old Dec 18, 2012 | 11:49 AM
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Yah wasn't trying to be a smart *** bout that either, just saying in general. lol
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