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#11
03-14-2012, 12:49 AM
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Re: NOS LS-7 Crate Engine 454/465HP Never Used
 
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#12
03-14-2012, 02:10 AM
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Re: NOS LS-7 Crate Engine 454/465HP Never Used
jason, is that 12.5 to 1 or 11 to 1?
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69 camaro Z-28 burnished brown X-77 bought 1978 70 camaro Z28 forest green M40 black vinyl roof PROJECT 99 camaro SS Hugger Orange 6speed no t-tops 1 of 54 11 cts-v black diamond edition wagon 556hp GONE 15 camaro Z/28 white AC brand new
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#13
03-14-2012, 02:18 AM
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Re: NOS LS-7 Crate Engine 454/465HP Never Used
I believe all LS-7s were 12.5:1. I have been planning to buy a bore-o-scope with camera to take pictures of the cylinders in assembled engines. Maybe this is a good excuse to buy one. If GM lowered the compression of the LS7, I imagine they would have changed the suffix code from XCH to something else. This is a true XCH LS-7.
Jason
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#14
03-15-2012, 12:01 AM
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Re: NOS LS-7 Crate Engine 454/465HP Never Used
OK, I went and bought and inspection camera/borescope at Costco. Quite a deal I think at $150. It takes video and pictures and came with everything to operate. Fun toy!
Anyway, the piston number is 3963551 which comes up as 12.25:1, first used in the 1970 LS-7 engine.  From GM Parts Direct Website: 3976014 High Performance Piston This 454 standard, pressed pin, high performance piston has a 12.25:1 compression ratio and an open dome. (ID#3963551 or 3976032). Used in engine assemply P/N 3965774. Thanks, Jason
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#15
03-15-2012, 03:41 AM
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Re: NOS LS-7 Crate Engine 454/465HP Never Used
Cool toy...takes a good pic....even cooler engine Jason. You have all of the cool stuff!
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Bruce Choose Life-Donate!
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#16
03-15-2012, 04:24 AM
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Re: NOS LS-7 Crate Engine 454/465HP Never Used
Thanks Bruce. I definitely have not had all the cool stuff. Once that happens I don't know what I will do. The good news is there is always more cool stuff out there. Once I think I have seen it all, something else even better pops up!
Jason
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#17
03-18-2012, 12:36 AM
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Re: NOS LS-7 Crate Engine 454/465HP Never Used
Sold pending payment.
Jason
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