Originally Posted by Pool Fixer
Originally Posted by AndyF
HP manifolds work just fine at 500 hp. I've built a bunch of different big blocks with HP manifolds and they plenty of power for a street car. Cam choice is critical with HP manifolds so talk to an expert. And make sure it is a real expert, not some kid on a tech line.

Here is an article that I wrote a long time ago on the subject. The technology has changed a little bit since then but probably not enough to make much of a difference: http://www.moparts.org/Tech/Archive/bb/Lobe.html


I rember you! haven't clicked the link yet but didnt you make 500hp with manifolds and ported edelbrock heads?


Depends on the engine. I've made close to 600 hp with HP manifolds on a street engine. The FAST guys make a lot more than that but their engines are not very street friendly. I'd say that 500 hp is fairly easy to do with a stock stroke 440. You need to pick the correct parts but you should be able to do it with off the shelf stuff. The key is getting help from someone who actually knows what they are talking about. I have several articles on my website that you can scroll thru. I did the HP manifold journey for about 20 years and I documented much of it.

https://arengineering.com/tech/