Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: mopar dave]
#2654215
05/11/19 12:35 AM
05/11/19 12:35 AM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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OP
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Posts: 248
near St Petersburg, FL
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Finished my first set of headers a while back. 2 1/4" to 2 3/8" with 4" collectors. Just sent them to Jet Hot for coating!
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2654216
05/11/19 12:41 AM
05/11/19 12:41 AM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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Right side. This one removes with only removing a couple of the plugs. Driver's side requires removing steering column and starter, plus a couple plugs. At least I don't have to move the engine!
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2654218
05/11/19 12:49 AM
05/11/19 12:49 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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If you do a couple of things to them you will save them from cracking.. cut each tube where they are tied together and drill one of the 2 holes on each tube a little bigger(doesnt matter what size hole).. that way they can grow with the heat( they will expand so they need to slide a bit) or they worp .. looks good.. I built a ton of headers at Chrysler EDIT this is a set I built for my W-9.. totally equal on all tubes
Last edited by MR_P_BODY; 05/11/19 01:00 AM.
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: MR_P_BODY]
#2654431
05/11/19 09:36 PM
05/11/19 09:36 PM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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Mr P Body, you're saying cut the flange between the tubes?
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2654440
05/11/19 10:11 PM
05/11/19 10:11 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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Mr P Body, you're saying cut the flange between the tubes? Yes I am.. after you trim them up nicely then drill one bolt hole a little larger per tube
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Dave Hall]
#2654456
05/11/19 11:13 PM
05/11/19 11:13 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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Mr. P! Check out those flanges he's using. I wouldn't cut them. Elongate the holes and be done. The only time I have cut flanges is for ease of R&R. Nice job Lifsgrt! Still gonna need to cut them.. they may worp in those areas or not.. but if you cut them that guarantees that they move.. just needs the bigger hole in each tube
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2654482
05/12/19 01:19 AM
05/12/19 01:19 AM
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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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Do you think the collectors need to be that long for that motor and the racing your doing? What are your plans for the operating range in RPM for that motor off of the push car?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Cab_Burge]
#2660983
05/31/19 03:35 PM
05/31/19 03:35 PM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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OP
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Hey Cab, I had not cut the collectors in these pics and they were still 18" long. I cut them at 13.4" from the ends of the tubes based on Pipemax data and other input I received prior to shipping them to Jet Hot for coating. It will be interesting to see how much steam this engine makes with my first effort at headers!
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2755013
03/23/20 01:14 PM
03/23/20 01:14 PM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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Hey guys, update on my 498" Bonneville bullet using THE Block. I cut the collectors to 13.4" and had them Jet Hot coated. Finally got it on the dyno at Best Machine. This endurance build with a single Quick Fuel Dominator made 947hp at 7400rpm and 690tq at 6800rpm through my first time built 2 1/4"-2 3/8"-4" collector stepped headers that fit inside the frame rails of my Daytona clone. I now wish I'd have gone with the recommendation of a 4 1/2" collector. Engine ran better with a 4" to 5" adaptor on the collector. I tried 4" extensions at 54" long in hopes of getting the exhaust out from under yhe car for speed runs and it killed 35 hp. Will try 5" extensions and see if that works.
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2756097
03/26/20 02:29 AM
03/26/20 02:29 AM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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OP
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near St Petersburg, FL
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Dyno info. Thanks again for the input, I appreciate it. Got the flanges, collectors, and other tubing bits and pieces from http://www.spdexhaust.com/ They have custom flanges that fit these Brodix B1 MC heads very well.
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: n20mstr]
#2779910
05/30/20 11:10 PM
05/30/20 11:10 PM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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OP
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Posts: 248
near St Petersburg, FL
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2 1/4" x 9" 2 3/8"× 17" 4" collector 13.4" long. In retrospect I should've went with a 4 1/2" colle tor.
Also, after engine shop spec d a 1250 Dominator, I spoke with BRE and sent them my 1150 Dominator for modification. Bob Book thinks that will work better. With the new 1250 QF, peak tq was 690 @ 6800-6900, peak hp was 947 @ 7400-7500, which Bob and others think should be further apart.
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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