350 to 400 cooling

[newguy]

im in the process of switching over from a 350 to a 400, with the 350 i have been running a 17x28 afco double pass with a good shroud, 1:1 pulleys and a 60 dollar water pump from speedway. this combo has worked well for me, however i am wondering if i will need to abandon the small radiator infavor of a 19x31 radiator to keep it cool? and what water pump and pulleys should i run? are the stewart stage 3 worth the extra 100 dollars over the afco water pumps? thanx for any help on this subject guys.

[newguy]

forgot to mention some things, these engines run on 110 not methanol, or e85, 350 is a 13:1 and the 400 is a 12:1 stock block.

[let-r-eat]

Current setup working on the 350 should be fine on the 400. A good Stewart pump should be mandatory for any engine making over 350hp. That's my opinion. Spend your money on the pump.

[newguy]

thanx for the help, i was under the impression that 400 blocks tend to run hotter then a 350 block, should i keep the 1:1 set up? or go with a reduction?

[istock11m]

Stewart pump, 1:1 pulleys and no restrictor.

[let-r-eat]

ditto, istock11m.

[newguy]

thanx a lot guys

[dirttrackrocker]

The center cylinders on 400's run a little hotter than the others. I have seen some engine builders run water lines to the center of the heads.

[perfconn]

Good engine builders do that on any engine