THANKS FOR YOUR INFO JUST KICKING THE THOUGHT BUYING NEW CRANKS ANYWAY.

Put a couple of pounds of boost to your 598 have more power accross the board.

Stick with the 598. I don't like the 632 just for the reason mentioned above.....rod angle. Probably 95% of the engines that I build are 598ci. Quite simply, they work.
If I understand correctly, you are making 890 hp NA? If you are, you must be turning them pretty hard. A 632 will not like sustained high rpm. Not to mention, that 3/4 stroke crank is heavier. It will be hard to make the rings, not to mention everything else, live at high rpms.
Eddie

For some reason I thought it was the other way around but I guess there's a couple different ways to skin the cat. :cool:

Eddie, on your 598's do you stick with the 6.535 rod or go to the 6.70?

My 580's have 6.70 rods. The pin is pretty far up into the oil ring and the pistons had to be custom but it seems to work out well, never any problems.

It depends on the engine. In the NA engines I use a 6.700 rod with a 1.25 comp height piston.
In the SC engines, JE doesn't make an inverted dome piston in a 1.25, only 1.27. In that case I have to use a 6.635 rod. You could use a 6.700 rod and a piston with a 1.12 comp height, but I'm not crazy about the piston. I don't like to run anything less than 1.25.
I haven't had any troubles from a 1.25 piston or the 6.700 rod.
Eddie

Might try Wiseco, they made mine with a 43cc dish, for a 6.7 rod and the 4.5 crank, ch 1.24

Thanks, but I look at it as the old saying goes....."if it ain't broke, don't fix it". I have had excellent results from the JE inverted dome pistons. I don't have anything against Wiseco, or anyone else for that matter, but what I have been doing has worked great for many, many years. I appreciate the heads up on the pistons. If I ever start having trouble with the JE's, I will certainly give them a look. Thanks, Eddie.

Stay with what works, I thought I heard Wiseco owns JE.

I hadn't heard that, but that doesn't mean anything.:D

It may be true, I just don't know. The only Wiseco pistons I have used were on an outboard. I have not heard of anyone having problems with them.
Eddie