Best way to go... 575 to 650 HP?
 

454 engines, 100 hrs on them. made 575 in HP in April and over the winter, want to make them at least 630 HP WITHOUT taking botton ends apart. Dont mind changing from flat tappet cam to roller, but thats it for the bottom. Present cam is a Comp cams grindNX274H. (113 lobe sep/230int..244 exh. dur @50". 551 lift int/ 568 exh.) Has forged standard bore pistons=8.5 to 1 compression. Square port heads and roller rockers. 177 Weiand Blower w/ holley 800 carb and 5 LB boost/bigger pulley. Mercury thunderbolt ignition and Stainless Marine WET exhaust. Made 575 at 5500 RPM and 600LBS torque at 4000 RPM. This is a great combo, but I want to go faster next year. Want to get your guys opinion on what would be the best way to make more power from here without breakin the bank!

Roller cam, innercooler and more boost and you will probably need more carb.

50-60hp per engine is only going to be good for about another 4 mph.

4 MPH is Perfect, right where I want to be ....

Fixx
 

I would try the pully and cooler first,if you can get the boost to 6-7 psi you will have more then enough to put you where you want to be...

for now:bigbird:

Hahaha, now what makes you say that???? :lolhit:

I don't know what pulleys you're running, but a 177 is kind of a small blower anyhow for a BBC. You may went to upgrade your blower if you're looking for more than 600Hp.

Remember superchargers are only efficient and produce good power up to a certain RPM, if you keep spinning them faster by using a smaller pulley eventually you lose efficiency and wear the blower out faster.

Yea, well if someone had a reasonably priced set of 250's I would sell my 177's. I only go WOT in short bursts too, 15 seconds max. I get too nervous Im gonna break something! Hhahahaha

if you have stock pully set up I have one of the pulleys you need..2.66 dia good for about 6-8 psi with your app, brand new, $125 shipped...Rob

Thanks EZ, but I already have both pulleys and belts.