Headers Wanted
Discussion
MyM8V8 said:
They would be the same. I have some Wortec 1.3/4s on mine which I will be changing later on for 1.7/8's. But it won't be until much later this year when the motor is stroked..
sorry, thread hijack! Will you be doing this with no other changes at some point, ie and dyno before and after?
MyM8V8 said:
They would be the same. I have some Wortec 1.3/4s on mine which I will be changing later on for 1.7/8's. But it won't be until much later this year when the motor is stroked..
sorry, thread hijack! Will you be doing this with no other changes at some point, ie and dyno before and after?
monkfish1 said:
MyM8V8 said:
They would be the same. I have some Wortec 1.3/4s on mine which I will be changing later on for 1.7/8's. But it won't be until much later this year when the motor is stroked..
sorry, thread hijack! Will you be doing this with no other changes at some point, ie and dyno before and after?MyM8V8 said:
monkfish1 said:
MyM8V8 said:
They would be the same. I have some Wortec 1.3/4s on mine which I will be changing later on for 1.7/8's. But it won't be until much later this year when the motor is stroked..
sorry, thread hijack! Will you be doing this with no other changes at some point, ie and dyno before and after?
Why do you ask good sage?
Just because im interested in the outcome of such a change.
monkfish1 said:
MyM8V8 said:
monkfish1 said:
MyM8V8 said:
They would be the same. I have some Wortec 1.3/4s on mine which I will be changing later on for 1.7/8's. But it won't be until much later this year when the motor is stroked..
sorry, thread hijack! Will you be doing this with no other changes at some point, ie and dyno before and after?MyM8V8 said:
I take it that from your experience there would be no advantage going the extra eighth then Rog?
The difference will vary according to a whole host of other variables, not least your cam and heads, and im sure there will be an advantage (assuming they are half decent headers). The question is how big? Until you try, you cant know, but id say you will wonder why you spent all that money afterwards.
http://www.eng-tips.com/viewthread.cfm?qid=104735&...
Though that thread will screw your head up. Best to look at the simple version above in my other post.
I think I calculated dual 2.5" exhaust good for 540fwhp and dual 3" for 740fwhp or there abouts.
Primary header size is based on cam lift, exhaust flow etc. If you are doing a nice chunky stroker Im sure there will be more there, but more to be found in the 3" exhaust than headers size Id suggest. If you are only changing headers and not exhaust or heads etc then it would be interesting to see what the gains were. The more mods and power you have the better the larger stuff will be.
I know LG Motorsports in the US like 1.75" headers on their LS7 stuff still over the 1.875" though some pretty serious race engine builders swear by 1 7/8 stuff being better.
Though that thread will screw your head up. Best to look at the simple version above in my other post.
I think I calculated dual 2.5" exhaust good for 540fwhp and dual 3" for 740fwhp or there abouts.
Primary header size is based on cam lift, exhaust flow etc. If you are doing a nice chunky stroker Im sure there will be more there, but more to be found in the 3" exhaust than headers size Id suggest. If you are only changing headers and not exhaust or heads etc then it would be interesting to see what the gains were. The more mods and power you have the better the larger stuff will be.
I know LG Motorsports in the US like 1.75" headers on their LS7 stuff still over the 1.875" though some pretty serious race engine builders swear by 1 7/8 stuff being better.
Edited by ringram on Thursday 12th February 22:41
Gassing Station | HSV & Monaro | Top of Page | What's New | My Stuff