How much for a stock block?

How much hp can I expect to make with a stock 400 Mopar block half filled? Its been working fine so I dont want to trash it. Do I dare try a blower or should I stick to low levels of spray? Im assuming its also a stock crank. Its time to freshen so things can be changed. Currently about 660 horse. Just looking to go faster not break records.

 

A buddy of mine is making a reliable 730 horse on motor,and 1050 on spray.Been doing it for 5 years now ,no major probs.This is also half filled and with a bottom end girdle.3500 lb car 10 inch tire,727, best 9.25 @148.

 

I have no girdle. Its an 1800lb RED that does 8.60s at 153. Id like to get into the 7s. Lightening up the driver would no doubt help a lot.

 

I made approximately 1000hp on a stock 440 block that was filled to the top with hard block and had billet main caps. It had a 6-71 retro that made about 25 pounds of boost. I had about 30 passes on it with no problems.

My only advice would be don't use a set of dinged up aluminum rods. I am sure everybody here can guess how that ended for me.

 

you will know when you have passed the line in the sand
as it will start cracking cly walls all the way down to the mains then you have went to far
dont ask how i know this...many years ago...