New Block 5693740

[Agentspd]

Got a follow up question regarding the coolant flow through the engine blocks. If you order a brand new block these days it seems to sub up to part number 5693740 which from what ive noticed will pretty much fit any isx. It has the lower rear paralellogram shaped egr/coolant return port. But it also has the small 870 style egr coolant ports in the side of the block. The block kit come with a little bag of stainless frost plugs to use depending on your application. My question is this: this new block , the cooling flow issue that running with no egr cooler flow to rear cylinders must have been resolved in the casting?. Thus the need for either an egr cooler or thr cooler bypass kit is not required?. I was wondering because hypothetically if you installed an 870 egr cooler and blocked the paralellogram port, then the flow through the block must be suffucient?.

[Rawze]

Looks to me like you got some bad information there?.


looking at quickserv.com, it shows for the ...

CM870 - cylinder block casting p#3682861

CM871 - cylinder block casting p#3684715

CM2250 - cylinder block casting p#3686829

CM2350-X101 cylinder block casting p#4311621

CM2350-X15 Efficiency-series cylinder block casting p#4311621

CM2350-X15 Productivity Series cylinder block casting p#4311621

CM2350-X15 Performance series cylinder block casting p#5440753

They are different castings, and different part#'s.

Different engines also use different crankshafts and other components too.

Also,.. it is not just the engine block itself that dictates coolant flow but the head gasket and head as well. Just an example, The CM570, 870 head gaskets have larger passageways in the head gasket itself at each cylinder for coolant flow around each liner vs. newer engines with EGR coolers.