Obs ????
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Obs ????
OBS - Old Body Style. Check this thread, lots of good acronym info!
http://www.ls1truck.com/forums/power...rminology.html
any OBS small block will have the two middle exhaust ports almost touching rather than evenly seperated like the LS and big block engines.
Pretty much any non-LS engine they put into older (pre 1999) trucks: 350, 305, 454 ect
thanks .........got it
The 88-98 trucks were GM designation GMT400. That is the body style that is typically known as an OBS (Old Body Style). OBS is not really a good description because it is already outdated and will be even more so when the next body style comes out.
Jeff