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5.3L head questions

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Old Jul 29, 2003 | 11:09 PM
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Default 5.3L head questions
Without shaving them what is the compression? Also, wouldn't 11:1 CR be alittle too high for pump gas?
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Old Jul 30, 2003 | 11:57 AM
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Default Re: 5.3L head questions
If memory severse me correctly I think you'll be around 10.7:1 with 5.3 heads uncut. Alot of places work on the chambers though & it will kill some compression. We sell Patriot heads with stock or modified chambers depending on the flow needs & compresion needs. Your not planning on running stock 5.3l heads though are you?

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Old Jul 30, 2003 | 02:12 PM
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Default Re: 5.3L head questions
I was told be Jay when I purchased my 5.3 SII's that it would be around 11:1. And no 11:1 is not to high for 93 octane.
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Old Jul 30, 2003 | 02:17 PM
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Default Re: 5.3L head questions
5.3's here cut .015" yields 11:1. I think uncut yeilds 10:8:1.... 93 Pump gas is fine for 11:1
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Old Jul 30, 2003 | 02:41 PM
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Default Re: 5.3L head questions
If memory severse me correctly I think you'll be around 10.7:1 with 5.3 heads uncut. Alot of places work on the chambers though & it will kill some compression. We sell Patriot heads with stock or modified chambers depending on the flow needs & compresion needs. Your not planning on running stock 5.3l heads though are you?

Have Fun!

Thanks for the info, and nope I am not planning on using stock 5.3's. The valves are too small, I am getting a set ported and shaved.
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Old Jul 30, 2003 | 08:08 PM
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Default Re: 5.3L head questions
The compression should be fine. I have 11 to 1 and run fine on 93. No KR etc. Your 227 cam will bleed off the excessive compression at low RPM. Should be fine.
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