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Old Oct 13, 2006 | 01:44 PM
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Default 317 casting

Could someone tell me where to find out if the 317 casting cylinder heads that I have really belong to the 345 horse 6L. Thanks
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Old Oct 13, 2006 | 03:13 PM
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I bought a new Escalade Crate motor last year (6.0, 345HP rating), it has the 317 heads on it.
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Old Oct 13, 2006 | 03:29 PM
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Chapter 2, page 28 of "How to Build High-Performance Chevy LS1/LS6 V8's, by SA Books.

2001 - 2004 LQ4's have 12562317 heads
2002 - 2004 LQ9's have 12572317 heads.

These heads have a "D" shaped exhaust port.
They have a 72cc chamber.
The valve springs should be a natural metal color.

The LQ4 has a 9.4 Compression
The LQ9 has a 10.0 Compression.

The difference is the pistons.

Hope this helps
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Old Oct 13, 2006 | 05:07 PM
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Thanks for the quick reply. I am putting a supercharged combo together for the 67. Thought we would get started now, and have it together for next season. Know of any good chassis shops that could do this install.
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