Quote:
Originally Posted by MusicMan70
Which year would these be from? I also have a set like this minus the "Magnum" script and lightning bolts.  |
looks like 66-68, that does not have the big angle to it like a 60-66, it looks flat, so I am thinking 67-68?
here is some info:
The 477.7-cubic-inch (7,828 cc) 478 was one of the largest V6 engines ever built. Gross output was 235 hp (175 kW) at 3200 rpm and 440 lb·ft (597 Nm) at 1400 rpm. Bore was 5.125 in (130.2 mm) and stroke was 3.86 in (98 mm). It was introduced in 1963 in the 6500 series trucks.
It was superseded by the 1966 478M "Magnum" series, and production ended by 1974. Gross output was now 254 hp (189 kW) at 3700 rpm and 442 lb·ft (599 Nm) at 1400 rpm.
also:
http://www.6066gmcguy.org/Jolly-401v6.htm