Doug57 - the Trademaster designation is for a particular 283 engine - there was also a Loadmaster - both started about 57 +/- and were used as long as the 283 I believe

any info I've seen indicates GM never used actual series names except for the AD and TF years

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics