The 651 works well in a 540 blower motor. I think its a little big for a 496. The 741 ground on 114 lsa would be my choice.

That nice numbers for a 496 stroker with a 250 blower :drink:

Not sure I would do more cam at this point. I'd slap a larger blower like a 420 b&m, slow the blower down, and maybe run it to 6lbs of boost. Probably pick up a bit of power, and the blower will live longer.

I'd imagine on that setup, the 250 blower at 5lbs intercooled, is probably overdriven quite a bit. Guessing you are still running the 250 blower overdriven quite a bit based on those massive torque numbers from 3000rpm and up. :drink:

Mild Thunder,
Right now its a 489, Bored .030 over. Bob is going .060 over which will make it a 496. I think thats his reason for the bigger cam.

I doubt the extra 7ci will matter much. If anything, maybe gain a tad of airflow from the larger bore unshrouding the valves a bit more.

The 741 is 114lsa cam, where i think the 731 is 112lsa. The 114 might make a little more cylinder pressure. I suppose if the engine is torn down already, go for it. I assumed it was together already.

Im sure the 741 will keep pulling past 6000. Use some good lifters and maybe some stud girdles! Keep us posted on the results!

...

139741 grind is the cam I'll try then . I wanted to try a dual carb set up this time ... hoping for better distribution of fuel. The 250 single set up have a tendency to leanout the forward cylinders . B&M had a plate that move the carb about 1.5 inches forward to correct the problem. I found a set of new /old stock dual quad adapters from Holley so why not give it a try.
The reason for the bore to 4.310 is a cylinder with some pitting that I couldn't hone out last June when I repaired the port engine ( head gasket ... burn't #6 pistion ) to save the boating season I decided to run it as is . It ran fine but was pushing oil out the dip stick after a hard run . After 4 seasons on these short blocks its time to freshen them up .

Always looking for more ... Thanks for the help everyone !

The 525EFI cam is 741 that is ground on a 114 lob sep instead of the standard 112 lob sep.
http://www.summitracing.com/parts/CRN-168741/

Good choice on the 741, think about doing the 7/4 swap while at it. Also I liked Mike280s idea on the 1.8s for the exhaust valves. Add shaft mount rockers and you should get a nice pop.

Being that your my running buddy should I still be looking for a set of peanut ports ?:grinser010:

with his current cyl heads,i agree,the 741 would be better,but if he goes with a better set of heads,even though the motor is small,the 651 will make more hp,but at a higher rpm,and when he gets ready to go with a bigger blower[as everyone who has a b&m eventually does]he will see even more gain.