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Re: collector size for 468 sbm
[Re: R3DART]
#1978612
12/29/15 03:21 PM
12/29/15 03:21 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Hello folks.
I am looking for some opinions on whether I should have my headers modified for a bigger collector.
I have the 1 7/8 TTI with 3" collector for W2 heads
From what I understand, the new version of these headers come with 3.5" collector.
So my question is, do you think it's worth it to modify the collector and destroy the coating?
How much performance am I leaving on the table by staying with the 3"?
The combo is as follows;
468 ci
Indy 245 cnc
Pump gas
Solid roller
1050 dominator
Car is 3000 lb (with me) abody
727
5200 stall
Dana 60- 3:91
Thanks in advance guys.
What RPM do you turn... but I would think a 1 7/8 pri and a 3" collector are small... if you want you can PM me and I'll run your engine specs through my header program for the proper headers 
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Re: collector size for 468 sbm
[Re: R3DART]
#1978690
12/29/15 04:52 PM
12/29/15 04:52 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Thanks for the response.
SpareParts; Not really a max effort although I plan to keep tweaking as I go.
Now would be the time for me to do it (change collector) if it made sense.
But by the time I get someone to do it and have them recoated, it's not going to be pocket change....
Mr P, I will pm you some specs.
I am curious on this, probably no point in fooling with collectors if tube size is not ideal as well.
If that turns out to be the case, it makes the decision easier. After you PM me I'll send you what I need.. as for what you have now it might be worth selling them OR changing the collector.. that would be your choice.. I use a 3.5" collector on most anything(either big cubes or high rpm)
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Re: collector size for 468 sbm
[Re: R3DART]
#1979041
12/30/15 12:30 AM
12/30/15 12:30 AM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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I would want to see 2in/3.5 collector for sure on some thing that big.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: collector size for 468 sbm
[Re: R3DART]
#1979043
12/30/15 12:32 AM
12/30/15 12:32 AM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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I am going 2 to 2 1/8 to 2 1/4 with a 4 inch collector on my 422.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: collector size for 468 sbm
[Re: 1967dartgt]
#1979072
12/30/15 01:02 AM
12/30/15 01:02 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I am going 2 to 2 1/8 to 2 1/4 with a 4 inch collector on my 422. I just sent him his numbers.. it calls for 2.027" to 2.152" dia and a collector dia of 3.686"to 3.936"with a length of 16.1".... thats for a bigger engine than yours... if you go bigger on dia it also changes the pri lengths...remember that is a timed length based on a dia.... all the specs I quoted are OD with a .062 wall edit for a 3 step headers your diameters are close enough but you need to figure the lengths.. the 4" collector is close enough also... without running numbers
Last edited by MR_P_BODY; 12/30/15 01:06 AM.
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Re: collector size for 468 sbm
[Re: R3DART]
#1979112
12/30/15 01:38 AM
12/30/15 01:38 AM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Mines a nos motor so short is your friend. Just need to get heat out as fast as you can with no major restrictions. I was running 2 in with 3.5 collectors before.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: collector size for 468 sbm
[Re: 1967dartgt]
#1979233
12/30/15 11:56 AM
12/30/15 11:56 AM
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Joined: Mar 2009
Posts: 814
in front of the computer
80arrow
super stock
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super stock
Joined: Mar 2009
Posts: 814
in front of the computer
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I am going 2 to 2 1/8 to 2 1/4 with a 4 inch collector on my 422. Are these something you are building yourself? Or do you have someone lined up to build them?
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Re: collector size for 468 sbm
[Re: 80arrow]
#1979237
12/30/15 12:07 PM
12/30/15 12:07 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I am going 2 to 2 1/8 to 2 1/4 with a 4 inch collector on my 422. Are these something you are building yourself? Or do you have someone lined up to build them? These are what I built for my 405ci W-9.. three step 1 7/8- 2 -2 1/8
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Re: collector size for 468 sbm
[Re: MR_P_BODY]
#1979251
12/30/15 12:38 PM
12/30/15 12:38 PM
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Joined: Mar 2009
Posts: 814
in front of the computer
80arrow
super stock
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super stock
Joined: Mar 2009
Posts: 814
in front of the computer
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I am going 2 to 2 1/8 to 2 1/4 with a 4 inch collector on my 422. Are these something you are building yourself? Or do you have someone lined up to build them? These are what I built for my 405ci W-9.. three step 1 7/8- 2 -2 1/8 Those look awesome. I'm sure I'll have to make my own headers but figured I'd ask about 1967dartgt's set. I really don't want to make a set for my car, lol.
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Re: collector size for 468 sbm
[Re: 80arrow]
#1979260
12/30/15 12:51 PM
12/30/15 12:51 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I am going 2 to 2 1/8 to 2 1/4 with a 4 inch collector on my 422. Are these something you are building yourself? Or do you have someone lined up to build them? These are what I built for my 405ci W-9.. three step 1 7/8- 2 -2 1/8 Those look awesome. I'm sure I'll have to make my own headers but figured I'd ask about 1967dartgt's set. I really don't want to make a set for my car, lol. The one thing you want to TRY for is having equal length primaries... this s a timing thing for the exhaust, so they will draw on the overlap at the proper time(equal length)... but also.. the number one thing is to get them to FIT in the car so you do what you have to to make them fit... on a true merge collector they have to be designed to fit the engine and RPM.. they are NOT a one size fits all
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Re: collector size for 468 sbm
[Re: MR_P_BODY]
#1979338
12/30/15 03:14 PM
12/30/15 03:14 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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Headers on nitrous motors are not important?
Charlie Buck implied they were more important on nitrous engines. Especially those that have limited camshaft core availability when exhaust event timing is very important.
I'm building a new set. Mike, let me know exactly what you need. I think I remember. Will have 6 feet of 4" pipe with X-pipe after collector.
Will guess 2"/2.125"/2.250" 6"/10"/12" on primary length.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: collector size for 468 sbm
[Re: Leon441]
#1979802
12/31/15 12:31 AM
12/31/15 12:31 AM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Headers on nitrous motors are not important?
Charlie Buck implied they were more important on nitrous engines. Especially those that have limited camshaft core availability when exhaust event timing is very important.
I'm building a new set. Mike, let me know exactly what you need. I think I remember. Will have 6 feet of 4" pipe with X-pipe after collector.
Will guess 2"/2.125"/2.250" 6"/10"/12" on primary length. That was from Ron Rhoades who builds headers for a living and is the fastest sb nos car in x275 in the country. His thinking has gotten his 23° small block to go 7.08 in the quarter letting out at 1000-1100 feet because it's geared for the 1/8. I guess he doesn't know what he is talking about you know more. Lol Oh yea, he (Ron) built the headers on the fastest bb nos car in the country.
Last edited by 1967dartgt; 12/31/15 03:42 AM.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: collector size for 468 sbm
[Re: 80arrow]
#1979812
12/31/15 12:38 AM
12/31/15 12:38 AM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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I am going 2 to 2 1/8 to 2 1/4 with a 4 inch collector on my 422. Are these something you are building yourself? Or do you have someone lined up to build them? I have a professional header builder making mine.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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