Reply to "Dart 427 oiling system advice"

cam oil is restricted in the block main bearing saddles as you suspect, this is where the 4 small Moroso/Roush restictors are fitted in factory blocks. the single large plug goes into the angled galley under the #5 main bearing, that feeds the lifter bank on the side that does not oil the mains. you'll need to determine if the Moroso/Roush kit will work in your Dart block, depending upon the existing size of the drillings from the main saddles to the cam bearings

a neat trick that allows you to forgo the restrictors, you can simply drill your own oil orifice holes 180* from the original holes in the bearings and install them to use your holes instead

or you may subscribe to the concept that cam bearing restrictors are redundant because the cam journal itself is being pressured by the valve springs to seal off the cam bearing oil feed holes?

but Dart blocks are different. all the cam bearing bores in the block are the same size whereas Ford used 5 different size holes. Dart uses SVO style bearings that all have the same OD but change the ID to suit the cam, you can use a stock Ford layout with 5 different journal sizes, or choose from 2 specialized variations using typical journal sizes; 2.081" or 2.051
http://www.dartheads.com/produ...tfile/aitfile_id/39/

have you seen what the Dart cam bearings have going on the backside? they're grooved and have multiple oil orifices rather than a single hole at the bottom

http://www.dartheads.com/products/cam-bearings.html

it's possible that the groove itself is all you need in the way of a restrictor, and the bearings should be installed so that none of the holes aligns with the drilling in the block