I have a 9.5 to 1 510 647hp was looking at a used 250blower and cooler it came from 565ci made 650hp 5lbs, if I were to get this would I be able run 6lbs and make 775hp or am I wasting my money and put on a 671 or 871 this winter. oh at 5050rpm I MADE 600HP AT 5800 i MADE THE 647HP TQ WAS 627 AT 4800. THANKS ART

Isn't a 250 and a 671 about the same size?

I personally believe 9.5:1 and 6lbs boost = race gas.

The high load of typical boat + ton of cyl psi = sizzle

I would remove the SC thought from your head unless a piston change is made.

A 6-71 is about the same size as a 420.

yes a 671 is the size of a 420 thats why I asked about the 250 but it had a cooler with it carb so I was thinking another 125hp or 150 hp but its been all most 24hours and I'M THINKING SOME THING DIFFERENT THANK YOU FOR THE IN PUT ART PS SOME TIMES I JUST GO OH THIS IS A QIUCK FIX THANKS AGAIN FOR FLYING ME LEVEL