HARLEY SHOVEL

         The TWIN CAM 88 was released in 1999.Harley Davidson original nicknamed this a “BLOCKHEAD” due to the fatter top end.This was not a nickname that caught on.The TWIN CAM has a 2 piece rocker box cover and the centers of the covers look like they have a block sticking out in the middle of the side.They have 2 cams unlike any of there predecessors, improved oiling system and 60% more cooling fins.Their are many models of TWIN CAMS the original is the 88 built from 1999-2006 which was a 1450cc engine.The next was the TWIN CAM 88B (B stands for counter balanced),2000 they released the 95 TWIN CAM a 1550 cc engine used in CVO models, a 96 TWINCAM 1584 cc model used in the STREETBOB, SUPERGLIDE and DYNA MODELS.The 103 TWIN CAM 1690 cc engine was used in TOUR MODELS and the 110 TWIN CAM 1802 cc was used in CVO models.

Evolution engines were built from 1984 till 1999.They can be identified by the blocky rocker boxes, which earned them the nickname Blockhead.These were 1340cc/80ci engines that replaced the Shovelhead. Both the heads and cylinders are made from aluminum which helps with cooling and is lighter than its cast iron predecessors.Yet another improvement was that the heads were redesigned to allow for a higher compression ratio.These new engines were designed on a computer which  resulted in a smoother,quieter,more powerful and reliable ride. Not every Big Twin in 1984 had an Evo engine Shovels were still being made at this time.Some of the first production still had a 4 speed transmission with solid mounts.Although isolated mounts and a 5 speed were offered in the early eighties.All who stuck with the Shovelhead did not have this option they were still solid mount with a 4 speed.