Help with my first engine build (5.9 Magnum)

ValleyRat said
That's great information. I 've been told that the stock Magnum cams are very whimpy, but wasn't sure when I would have to start worrying about upgrading keepers and retainers with my choice of new cam. Its nice to know that I'll be able to use stock components (aside from valve springs).[/QUOTE

rumblefish360 said
It will increase flow but the fuel slides down the wall, not flow into the cylinders as expected. It’s an old timer trick that showed cfm on the bench but not power on the engine as expected.

Better off doing a bowl porting and a race prepped valve job. This will effect flow in the lift range of the valve lift with the cam you have. (Or getting.)

Check out Hughes retainers if you run that cam. They are designer to provide extra clearance between the retainer and the valve guide. I didnt know about them until i had finished my magnim. My lift is 512 and I only have Less than 20 thousandths clearance between the retainer and valve guide. Also check out the 1110 ?? Valve Springs that are Good for 550 lift. Also check your piston to valve clearance with modeling clay. I believe that 80-100 thousandths is the " General rule." Dont clean the pistons mechanically or with strong chemicals. There is a friction reducing coating on the skirts.