Let's talk about valves
Thread Starter
Registered User
Joined: Jun 2001
Posts: 425
From: Lakeland, FL
Let's talk about valves
Alright, the heads are off the car and I am going to be increasing the valve size to the 2.02,1.60 setup. Now, which valves are recommended? Just looking through my Summit catalogue I can see that there are several options mostly related to weight and flow. Some are undercut,backcut, tuliped, sodium filled....what does all this mean and at what would I want to stay away from for a street car running in the mid-low 11s.
What does cutting the valve do for you...3 angle,5 angle and so forth?
What does cutting the valve do for you...3 angle,5 angle and so forth?
Registered User
Joined: Feb 2001
Posts: 3,068
From: Cincinnati, Ohio
Im going to jump in here too....
What is the best valve you can buy within reason.... I know there are pro-flo, severe duty, race mod (making these names up but valve guys know what i mean)....
What is the best valve you can buy within reason.... I know there are pro-flo, severe duty, race mod (making these names up but valve guys know what i mean)....
Registered User
Joined: Mar 2002
Posts: 4,827
From: Waynesboro, PA
Originally posted by atljar
Within reason was a qualifier
Within reason was a qualifier
Thread Starter
Registered User
Joined: Jun 2001
Posts: 425
From: Lakeland, FL
Well, I was given the links below on my local forum and they pretty well explain the different angles of the cuts but I'm still wondering about the different types of valves...
http://realbig.com/detomaso/1998-10/102.html
5 angle valve job http://flag.blackened.net/mopar/fig25.jpg
http://realbig.com/detomaso/1998-10/102.html
5 angle valve job http://flag.blackened.net/mopar/fig25.jpg
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Joined: Dec 1969
Posts: 3,499
From: PORTLAND, OR, MULTNOMAH
Well, the sodium filled jobbies are probably the LT4 valves. The hollowness would make them lighter and the sodium (may be to keep them cooler)?
Undercut valves would be lighter and the undercut (where the stem is narrowed under the valve head) should make them flow more.
Tulip is probably just an undercut valve.
Serious Duty valves probably are not undercut since that would probably make them less strong.
Now you know as much (or little) as I do.
I have the Manley Race Flow undercut 2" 1.56s.
I liked the idea of the increased flow capablity and didn't believe that I needed the Serious Duty valves for a Street/Strip application. avlesve thn
Undercut valves would be lighter and the undercut (where the stem is narrowed under the valve head) should make them flow more.
Tulip is probably just an undercut valve.
Serious Duty valves probably are not undercut since that would probably make them less strong.
Now you know as much (or little) as I do.
I have the Manley Race Flow undercut 2" 1.56s.
I liked the idea of the increased flow capablity and didn't believe that I needed the Serious Duty valves for a Street/Strip application. avlesve thn
Registered User
Joined: Dec 1969
Posts: 3,499
From: PORTLAND, OR, MULTNOMAH
Then again. I have heard of "tulip" valves (valves with dished heads) but didn't know there was an advantage, other than perhaps being a little lighter and providing larger combustion area.
On the other hand "tuliping" of valves usually means that excessive heat has caused the valves to become tulip like, i.e., the metal becomes soft and the valves sealing tends to pull the valve making the face dished and elongating the valve itself.
On the other hand "tuliping" of valves usually means that excessive heat has caused the valves to become tulip like, i.e., the metal becomes soft and the valves sealing tends to pull the valve making the face dished and elongating the valve itself.
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Joined: Jul 2003
Posts: 1,991
From: pa
Originally posted by S.J.S.
So do I. I'm surprised no one has mentioned this, but the biggest you'd wanna go on stock heads are 2.00 and 1.56. Did a lot of research on this when I ported and polished my heads. I chatted with Phil and LLoyd and both informed me of that. You wont get anything out of going any bigger because the combustion chamber on the stock heads aren't condusive to any larger sixed valves.
So do I. I'm surprised no one has mentioned this, but the biggest you'd wanna go on stock heads are 2.00 and 1.56. Did a lot of research on this when I ported and polished my heads. I chatted with Phil and LLoyd and both informed me of that. You wont get anything out of going any bigger because the combustion chamber on the stock heads aren't condusive to any larger sixed valves.
Last edited by amean94ta; Nov 26, 2003 at 06:11 PM.
