I have just got a Holley Mega Blower and want to know what it compares to? I believe it's a 420. Does that mean it's a 4-71, or is it closer to a 6-71 due to the air it flows? I just swapped the 177 that was on my 525sc with the new Mega Blower and would also like to know what kind of horse power gains I can expect to receive. It's got dual 750s and I have not decided on how much boost to run.
Thanks for all the help.