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Thread: Gmc 11.5 l v12
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11-18-2020, 12:51 PM #1
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Gmc 11.5 l v12
I just found out this week that these existed
Compression ratio was 7.5:1. Bore and stroke were 4.56 inches by 3.58 inches, respectively, yielding a displacement of 702.4 cubic inches. The gross brake horsepower rating was 275 horsepower at a lazy 2400 rpm. 630 lb-ft of torque at 1600 to 1900 rpm. 1485 lb
https://driving.ca/gmc/auto-news/ent...nd-it-was-huge
And I just found out today that someone is/was hot rodding them
https://www.hotrod.com/articles/ccrp...es-horsepower/
http://thunderv12.com/
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11-18-2020, 08:03 PM #2
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Looks like 409 based valve covers.
I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
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11-18-2020, 08:32 PM #3
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The V12 heads and valve covers were from the GMC pick up V6
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11-18-2020, 08:45 PM #4
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We posted on them before. Can also get performance building.
Airport vehicles, firetrucks, missile launchers.
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11-18-2020, 09:38 PM #5
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That is what I was thinking. My friend's dad had a 3/4 ton GMC with a big V6 in it.
Originally Posted by David
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