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A front view of this SOHC 427 engine shows the familiar, deep-skirted FE series cylinder block. The difference between the SOHC 427 block and it's FE cousins is the two oil return passages cast and machined at the rear of the block's deck surfaces to allow for oil return from the cylinder heads. In this photo, the standard FE timing chain and gears remain in place to run a special stub cam, fitted in place of the conventional camshaft to turn the engine's oil pump and distributor. The two camshafts, mounted on top of the cylinder heads, are operated by their own 6-foot-long timing chain. The SOHC timing chain's tension is maintained via the device depicted at the left of the photo with the idler gear on the right. An eccentric to operate the fuel pump is bolted to the idler.