A rebuilt one starts at $10,900, if you’re thinking of upgrading your pickup.
There’s even a company dedicated to the V12, ThunderV12. Here’s the B702 chassis and engine before that fanciful body was draped over it. The 702 V12 has found its way into a number of “specials” including the Blastolene B702. As with the irrigation pumpers, such, the GMC V12 effectively helped kill the legendary Hall-Scott OHC hemi V12 engines in those roles, because the GMC was considerably cheaper. This was also the case with fire engine pumpers, which required high output engines. Only about 5000 of the V12s were built between 19, and many of them were used as stationary industrial engines like irrigation pumps, where they ran at full (governed) throttle for weeks on end. Now that was something to hear at full chat. That’s quite a contrast to the HD 427 Chevy V8 truck engine, which made 260 hp 4000 rpm, and 405 Ft. Very memorable indeed.Īlthough it hardly sounded like a Ferrari the V12 had the lowest specific output of the whole V6-V12 line: 250 or 275 hp at a low 2400 rpm and 585 or 630 lb.ft. The 702 has its own block, but obviously shares many internal components as well as the V6 cylinder heads, valve covers and even intake manifolds and carbs.Īnd although they’ve ended up in some wild rods, these engines were available in the GMC steel tilt cab COE, exactly like the one that stood in front of me with a V12 badge at a red light, on old Hwy 40 outside Baltimore as I was hitch hiking, and then heard accelerating through its very many gears and straight pipes.
Let’s get the biggest myth out of the way first: these are not two 351 cube V6 “bolted” together. But it’s acquired an outsized reputation, and is a cult object for certain hot-rodders and lovers of outsized engines, so let’s give it its 15 minutes of CC fame. V12 truck engines were not unheard of in the US and Europe, and the GMC’s 60 degree V6 certainly lent itself to doubling up. ( first posted ) The GMC “Twin Six” 702 V12 is legendary, although it’s not really all that unusual.
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