Stock exhaust valve vs. Manley/Ferrera exhaust valve?

[NCTURBOS]

What is the performance difference between the stock exhaust valve that has been back-cut versus a Manley or Ferrera exhaust valve? Flow #'s, etc.


TIA,

Keith

 

[FastGN007]

I'm not really sure there is a significant difference in performance between the stock undercut valves and the aftermarket ones. I'm sure someone else could discuss flow numbers and touch on the performance. But the reason i replied is because the stock GM valves are two piece. When the car starts getting faster, there is a chance that the valve could break which could damage a piston etc. The Manley Valves are much stronger. That is why i would use an aftermarket valve. Just my .02.

Scott

 

[The Radius Kid]

Try the Ferreas.Very well made.
I just bought a set for stock heads and they're real nice,just a step better than Manley in quality and finish.
The reason I went Ferrea,sight unseen?
A friend of mine races sprint cars.
The sprinters were tearing the heads off of the Manleys,so they switched to Ferrea.
No more problems.
Hope that helps.

 

[49-blues]

whats a good sourse to get the Ferreas?

 

[Intercooler]

Originally posted by 49-blues
whats a good sourse to get the Ferreas?

I am not a source per-say but I can get them for you. The 6000 series runs $200.00 for a complete set. What I have in my heads

 

[NCTURBOS]

The reason I asked the question is because I am able to get a new set of the Ferrea 1.775 intake valves for $60.00. And I wanted to know if it was worth getting the exhaust valves also. The customer is on a budget and a local porter is doing the heads for free just to try and get his name out.

I guess I'll get a set of the 1.50 exhaust valves to match.


Keith

 

[The Radius Kid]

Excellent idea.