GMC 702 Twin Six V-12

[OrrieG]

I did not even know these existed until a few years ago. I found them on a site for irrigation engines (I was researching Hemis). Here is a link to some info. Googling GMC Twin Six turns up a bunch of information. The look cool but unfortunately are a mule, max rpm is about 2500 (275 HP) but they have 630 ft # torgue at 1600, just right for running the large irrigation pumps found around here and in CA. Also good for heavy trucks of the era. They are expensive to buy in any shape and expensive to rebuild (like 8-10K).

http://www.curbsideclassic.com/blog/...s-at-1600-rpm/

A couple of months ago I went to a wrecking yard in another town I had not been to in a while. They had one sitting in the parking lot. Here are some pics. It has one block casting, 4 heads, 2 intakes, 4 exhaust manfolds and unique distributor. The intakes and valve covers are different from the V-6 engines of the era.