SSC5R

Im building a 427 blown 15lbs of boost car. I know that on a blown car the exhaust plays a good roll. What size of header should I get and what does step headers mean? Thanks for you're help.

UnbelievabLS1

iTrader: (5)

At the very least I would do a 1-7/8" to 2" stepped header. Stepped means, that approx. 1/3 or so the way down the primaries, the tube length switches from 1-7/8" to 2". In most cases, this will increase mid-range torque, and top end horsepwer.

You might even think about a 2" to 2-1/8" step if you have the room.

SSC5R

Thanks for you're help

LittleBoyBlu99

The Kooks 1 7/8 will be a good choice!

SSC5R

So wich of the 2 would be better to the big cubes and blower. I just got my stroker and its 4.125 bore and 4.125 stroke. Thats not a 427 I know. Its more like a 441. That's what happens when you let you're friends order for you. Thanks for your help.

1fstTA

iTrader: (25)

im building a 423 right now and I already have kooks building my 1 7/8 stepped to a 2 that is plenty big from what I understand after all my research.

Mike

SSC5R

thanks for the info