HOME FORUM RULES CONTACT
     
   
   

Go Back   CLASS RACER FORUM > Class Racer Forums > Stock and Super Stock Tech

Reply
 
Thread Tools Display Modes
Old 11-21-2011, 12:35 AM   #1
chassis1
Junior Member
 
Join Date: Nov 2003
Location: drag city, ne
Posts: 92
Likes: 1
Liked 9 Times in 3 Posts
Default Re: header tube size

for the combination you run, there are very interesting ways that are not simple to make the small engines move more air then ever thought. Believe it or not, it is done with the 4 into 1 and not the tri-y because of the cfm of the smaller heads......sometimes you can speed the air up too fast and the smaller engines do not like it.....

Chassis1
chassis1 is offline   Reply With Quote
Old 11-21-2011, 01:27 PM   #2
Wade_Owens
Senior Member
 
Wade_Owens's Avatar
 
Join Date: Jul 2007
Posts: 578
Likes: 0
Liked 3 Times in 1 Post
Default Re: header tube size

Quote:
Originally Posted by chassis1 View Post
for the combination you run, there are very interesting ways that are not simple to make the small engines move more air then ever thought. Believe it or not, it is done with the 4 into 1 and not the tri-y because of the cfm of the smaller heads......sometimes you can speed the air up too fast and the smaller engines do not like it.....

Chassis1
Wade_Owens is offline   Reply With Quote
Old 11-21-2011, 05:31 PM   #3
Jeff Teuton
VIP Member
 
Join Date: Jan 2002
Location: Houma, LA
Posts: 2,717
Likes: 2
Liked 325 Times in 50 Posts
Default Re: header tube size

Here is what we got; 360 motor wedge 1 5/8 to 1 3/4 to 1 7/8 with merge collector, 370 motor hemi; same size one runs to 7k, the other past 8k, the 370 liked a 1 3/4 to 1 7/8 about 5 better one made 540, one made 660.
__________________
Jeff Teuton 4022 STK
Jeff Teuton is offline   Reply With Quote
Old 11-21-2011, 05:56 PM   #4
Ed Wright
Veteran Member
 
Ed Wright's Avatar
 
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
Likes: 896
Liked 390 Times in 170 Posts
Default Re: header tube size

Strangely, mine doesn't appear to like step headers. Been running them (1 3/4" to 1 7/8") since last year, but I have never even had the thing on a dyno until recently. Bought them on the recomendation of someone I really respect. The step headers only appear to help down around 5000 RPM. Past that straight 1 7/8" picked it up everywhere. If I were foot braking they might be worth more. Wonder what I'm doing wrong, that it doesn't appear to like them, when everybody else runs them?

Thinking about trying a set of 2" primaries? My old, original-1975-rules-292" C/SM Camaro loved 2" headers. But, it was a stick car leaving over 8000. This is a 358" LT1 trans brake car, the converter hits about 6000.
__________________
Ed Wright 4156 SS/JA
Ed Wright is offline   Reply With Quote
Old 11-21-2011, 06:05 PM   #5
chassis1
Junior Member
 
Join Date: Nov 2003
Location: drag city, ne
Posts: 92
Likes: 1
Liked 9 Times in 3 Posts
Default Re: header tube size

1.750 is way too big for the lt1 first step.......measure the ports one of the heads, I think they are more D shaped and barely over an 1.500.....

and remember, just because it is a step header does not mean the steps are correct......

Chassis1
chassis1 is offline   Reply With Quote
Old 11-21-2011, 06:13 PM   #6
Ed Wright
Veteran Member
 
Ed Wright's Avatar
 
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
Likes: 896
Liked 390 Times in 170 Posts
Default Re: header tube size

Quote:
Originally Posted by chassis1 View Post
1.750 is way too big for the lt1 first step.......measure the ports one of the heads, I think they are more D shaped and barely over an 1.500.....

and remember, just because it is a step header does not mean the steps are correct......

Chassis1
The 1 7/8" are even bigger, yet made more power 5500 + up.
__________________
Ed Wright 4156 SS/JA
Ed Wright is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:49 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.