DO LONG TUBE HEADERS ADD HP? 1 3/4 vs 1 7/8 HEADER TEST. WHAT MAKES MORE POWER ON AN LS? BONUS TEST

HOW MUCH POWER ARE LONG TUBE HEADERS WORTH? WHAT MAKES MORE POWER, 1 3/4 HEADER OR 1 7/8 HEADERS? WHICH HEADER SIZE MAKES THE MOST TORQUE? DO LONG TUBE HEADER IMPROVE LOW SPEED TORQUE? HOW CAN I ADD MORE TORQUE? HOW CAN I ADD MORE POWER TO MY LS? DO LS EXHAUST MODS WORK? CHECK OUT THIS VIDEO WHERE I COMPARED 1 3/4-INCH LONG-TUBE HEADERS VS 1 7/8-INCH LONG TUBE HEADERS WITH TWO DIFFERENT CAMS (BTR TRUCK NORRIS AND SLOPPY BEST CAM). I ALSO TESTED THE EFFECT OF COLLECTOR LENGTH ON POWER BUT COMPARING A SHORT COLLECTOR EXTENSION VERSUS A LONG COLLECTOR WITH MUFFLERS. LOTS OF GOOD LS HEADER INFO HERE!

[minig]

Would have liked to see the 1 7/8” headers with a “ full exhaust” also keep the dyno runs the same color it’s confusing lol

[Pitman]

I learned more in 2 weeks watching your old videos than i did watching power block tv. Great work again man

[rbkills]

I'll be that guy and ask why no results with a crossover pipe or balance pipe? V8s benefit a lot in that scavenging rev range . And do boosted engines benefit?wether power or economy/fuel efficiency. Love the testing Richard. Playing with a 454 and a 250 blower pulled out for a freshen up

[Dunwelll]

Can you test with and without high flow catalytic converter?

[danawilkes]

I wish he would try more Tri-Y setups. These are designed for mid-range 2, 500 - 5, 500 where all of this testing is being done. Another I have not seen here anywhere is Megaphone type collector setups.

[blueovaldude]

I am more interested to see this test with a 600-650+ hp engine, to see the difference between 1 3/4" and 1 7/8" headers . 450-500 HP just isn't moving enough air for 1 7/8" headers. Thank you sir.

[robertwood]

This 100% correct that a full exhaust system will work better than open headers. I did this same experiment at the race track by putting a capable cutouts on my headers. When I took the caps off the headers the car slowed down 2/10 of a second in the 1/8. Put the caps back on and the car picked up and ran where it had previously. Glad to see the myth of 1 7/8 headers busted, I had long wondered about that. Thanks Richard.

[someinternetguy]

So where is the limits on either side? What does 2” or 1 5/8” or even 1 1/2” do?

Interesting findings, but time to min/max the crap out of this topic!

[autumnjeserich]

I was asking myself what size header do I need for my 402 and I just knew you had already tested it and made a video about it. 1 3/4 will be my path forward after I refill my argon.

[hisproperty]

G'day Richard. Thanks for another great video, but your results are not a great surprise to me.

I learned a long time ago that dips in an engine's torque curve are a result of a bad exhaust for the RPM range of the dip. This issue is more common with 2-stroke motorcycles than 4-stroke cars & bikes, and much more common on with aftermarket products than with factory products. Whilst the original exhaust system on a motorcycle prevents the engine from making its peak power, compared to an aftermarket system, the original system gives a smoother torque curve. Obviously the manufacturer has the opportunity & ability to test & refine an exhaust system, & they use that to create a well rounded system - from airbox to exhaust tip.

However, I do have a few questions for you. Have you considered trying a step design, say from 1 1/2"-1 3/4"-1 7/8"? Also, have you ever tried a cross-over design, where the outer 2 cylinders of 1 bank are collected with the inner 2 cylinders from the opposite bank? Finally, are the 1 7/8" extractors built with more anti-reversion than the 1 3/4" extractors?

Once again, thanks for a great video - I enjoy watching shows that encourage thought.


Andrew

[dylanaguiluz]

Okay. Cool. So now my questions is which of the 2 sound better? I like the idea of 1 3/4” headers in my Tahoe but what about the sound. How does it affect the sound

[makingcashlife]

Now let’s see 1-3/4” vs 1-7/8” vs 2” on a bigger cube motor say a 6.2 ls. I was not expecting these results but then again that’s why I watch your videos to see real world testing. So many people get wrapped up in peak power but under the curve is what matters.

[Kincentc]

Fascinating. Wish I got paid to do header R&D. Pretty sure with enough fabricating, you could erase most of those mid rpm dips. Little bigger here, little smaller there.... Header setups would be exclusive to the engine setup though lol

[sandmansimms]

Hey guys I am doing a efi 331 stroker just a nice weekend street car only, no track. My builder suggests that I do a 1 1/2 inch header and the rest of the combo will be an edelbrock performer rpm 2 intake, Brodix 20 degree 171 cc head, cam around .525 lift 108 lobe separation (that could change and be slightly larger), 70 mm tb, 80 mm maf, dyno tuned with 42 lb injectors. I can find 1 5/8 headers or there are more options anyway but have found the 1 1/2's in Headman as I looked briefly. Just curious as to your thoughts on the 1/4" making a difference either way positively or negatively for what I'm doing with the car. I'm going to expect for a minimum of around 350 rwhp.
Thanks

[mitchellerwin]

Richard, my man. Can you do a test on the BTR torque cam? In either a 5.3 or 6L that would be cool to see. I want a better low speed cam in my 2500hd without the chop or need for a looser stall. Maybe even some other cams that can be classified as “stealthy daily driver cams” not everyone wants the “chop chop”

[edwardcold]

I hope inch 3 quarter is enough for my 408 windsor 220 afr super Victor 850carb 680 healthy cam

[Anthony-hxgi]

Wouldn't you get the best benefit from cams and extractors through actually tuning it ? This is only tests with the same tune and not tuning for what you have done.

[dubandy]

Crazy how 1/8” difference make such a change in scavenging

[melvinmoten]

What are your thoughts about the 2-in headers for a 5.3 l ? I saw that these were offered by speed engineering for the 5.3 l. In your opinion, are these worth buying?

[jimmyfreeze]

Skip these puny header videos and get 2"