[Funky61]

From the Archives Previous Forum Posts...

The 478 was introduced in 1962 in the 6500 and 7500 series trucks, later in some 8500 series trucks. This included Conventional cab, tilt cab and rear engine buses. By the early 70's it was available only in the 7500 series, 74 being the last year of production for all GMC's V6 engines. They actually introduced two new displacements in 73 which were a 379 and 432. Basically GMC took the 351 and 401 and increased the stroke from 3.58 to 3.86 which is the same stroke as a 478's. If you really want to go with the 478 keep in mind that this engine is also externally balanced and you'll need a custom flywheel to fit the lighter duty application. I had Tilton Engineering fabricate one for the cost of $1100. Then had the crank, flywheel, and front hub and pulley from my 305E balanced as one assembly. A lot of weight was added to the crank but it still needed some on the flywheel and front pulley for proper counterbalance.
305,351and 401 engines are fully internally balanced and flywheels are interchangeable with just these three. 478's have 8 bolts holding the flywheel to the crank, 305, 351,401 have the standard 6
like most passenger car and light duty truck GM engines. What I'm trying to say is a 401 will be alot easier to install and much less expensive. But if you're like me and are very committed to such an idea like this then go for it. To me it was a childhood dream when I was 15 years old, about 21 years later I decided to finally to it. There's a wrecking yard in Ohio called Sam Winer Motors that has 351, 401 and 478 V6's, when I'LL find the phone number I will E-Mail it to you. I'LL be glad to help you with any other information whenever you decide to do such a conversion. Pete.
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ORGINAL POSTER: peternchronis@aol.com