Urgent: Need Advice On 454 BBC Headers For 71 Nova

[Salvatore]

[ QUOTE ]
Not to sound contrary to what's already been discussed, but a 2" header is a bit large for a relatively mild street BBC. A 1 3/4" header will easily support well over 500 HP, usually with the added benefits of more low end torque, plus they almost always fit better and offer better spark plug access than the larger tubes do. I haven't priced any lately, but they used to be considerably more affordable than the larger tubes as well.

Just something to think about. I fully agree with Eric!

[azcamaros]

I agree with Sam and Eric, 1-3/4" primary tube size is the best fit for your application. About 10 years a go I used a set of Dynomax brand headers with the factory coating on a 70 BB Nova with great results; larger tubes are not always the best applicaton for mild street motors IMO.

[markjohnson]

A 454 is a big motor and it needs big headers. Me and my friends make fun of big blocks when we see small block-sized 1 3/4 headers on a nice Rat motor. Might as well keep the exhaust manifolds. "You need back pressure" is a myth that header companies tell you when they want you to buy their inferior cheap, small tube headers or small mufflers.

[VintageMusclecar]

[ QUOTE ]
..."You need back pressure" is a myth that header companies tell you when they want you to buy their inferior cheap, small tube headers or small mufflers.

[/ QUOTE ]

It's not about "back pressure", it's about velocity.

But, to each their own. I'm not here to argue (or even debate) the subject.

Eric

[azcamaros]

Amen Eric