The 702 Twin Six - Hard To Top

Kinja'd!!! "HammerheadFistpunch" (hammerheadfistpunch)
02/11/2015 at 14:02 • Filed to: None

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its 1960 and your business of hauling boulders over the mountains has been suffering because you keep overworking your poor 501 so what do you do? You trade up of course, to a 702 cubic in 60 degree v12. GMC actually produced about 5000 such engines

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and although it looks like 2 V6 stuck together and 60% of the parts were common with the 60 degree v6 it was actually a unique engine. It features 650 ft-lbs (gross) of torque at 850 rpm and between 255-275 hp at 2400 rpm, a 180 lbs forged crank, 3 thermostats that allow for an astonishing 108 GPM flow. The HP figure is something unique as its still the most naturally aspirated horsepower at that rpm to run on 87 octane ever put in a vehicle. P.s. it was recommended for regular service only at 200,000 miles. It was meant for heavy duty truck work, but its probably best known as the engine in the Blastoline B 702.

Because of course they did.

One heck of a motor and car.

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DISCUSSION (6)


Kinja'd!!! PanchoVilleneuve ST > HammerheadFistpunch
02/11/2015 at 14:09

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DAT BLOWN GLASS GRILLE.


Kinja'd!!! Jordan and the Slowrunner, Boomer Intensifies > HammerheadFistpunch
02/11/2015 at 14:39

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Which was replaced by a 637 ci V8, that idled at a beastly 400 rpm.

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Kinja'd!!! cletus44 aka Clayton Seams > HammerheadFistpunch
02/11/2015 at 15:10

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I have the most twisted dream of putting the GMC double six into an early 60's hillclimb "special" body and racing about


Kinja'd!!! camaroboy68ss > HammerheadFistpunch
02/11/2015 at 15:57

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saw one in a trailer for sale last year at the Portland (OR) Swap Meet, complete motor, was really cool to see up close


Kinja'd!!! greenagain > HammerheadFistpunch
02/11/2015 at 16:25

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Well there I go, learning something new today.


Kinja'd!!! desertdog5051 > HammerheadFistpunch
02/11/2015 at 17:32

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Ahhh... the late 50's through the early 70's. Gas was cheap and power could be had in so many ways. Great post. Thanks.