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Holley Street Dominator modification #2234721 01/15/17 03:43 PM 01/15/17 03:43 PM
Joined: Jul 2005 Posts: 636 Graz, Austria DGS OP mopar
DGS OP mopar Joined: Jul 2005 Posts: 636 Graz, Austria	Does it make sense to modify a Street Dominator RB manifold in way to make it a true square bore manifold? Being a spread bore manifold there is a pocket between the manifold and the carb base plate when using a square bore carb. By welding the pocket there should be less turbulence, right?

Re: Holley Street Dominator modification [Re: DGS] #2234727 01/15/17 03:52 PM 01/15/17 03:52 PM
Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt. F fast68plymouth I Live Here
fast68plymouth I Live Here F Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt.	Hughes used to offer that modification to the single plane M1 intake. As I recall, tested on a 600hp 452 with stage 6 heads against one without that modification showed it to be worth around 5hp. 68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads

Re: Holley Street Dominator modification [Re: DGS] #2234731 01/15/17 03:57 PM 01/15/17 03:57 PM
Joined: Jul 2005 Posts: 636 Graz, Austria DGS OP mopar
DGS OP mopar Joined: Jul 2005 Posts: 636 Graz, Austria	Thanks, I might buy some aluminum rods and start my TIG welder then.

Re: Holley Street Dominator modification [Re: DGS] #2234759 01/15/17 04:58 PM 01/15/17 04:58 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	If you can do it yourself, that's cool. Hughes used to charge $350 for their mod, which wasn't a great ROI if all it got you was 5 HP.

Re: Holley Street Dominator modification [Re: DGS] #2234763 01/15/17 05:04 PM 01/15/17 05:04 PM
Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt. F fast68plymouth I Live Here
fast68plymouth I Live Here F Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt.	I was going off memory from your build. Was it in the 5hp range, or was there more difference than that? 68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads

Re: Holley Street Dominator modification [Re: fast68plymouth] #2234767 01/15/17 05:15 PM 01/15/17 05:15 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	I'd need to dig up some pretty old paperwork to be able to say exactly what we found comparing intakes, but wasn't a big improvement as I remember.

Re: Holley Street Dominator modification [Re: DGS] #2234768 01/15/17 05:15 PM 01/15/17 05:15 PM
Joined: Jul 2005 Posts: 636 Graz, Austria DGS OP mopar
DGS OP mopar Joined: Jul 2005 Posts: 636 Graz, Austria	This isn't overly complicated: add some aluminum and grind it to shape. Should be a 2-3 hour job

Re: Holley Street Dominator modification [Re: DGS] #2234769 01/15/17 05:18 PM 01/15/17 05:18 PM
Joined: Sep 2014 Posts: 4,457 Washington M madscientist master
madscientist master M Joined: Sep 2014 Posts: 4,457 Washington	I have found 15 HP on a Strip Dominator. Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

Re: Holley Street Dominator modification [Re: madscientist] #2234872 01/15/17 07:44 PM 01/15/17 07:44 PM
Joined: Jan 2003 Posts: 1,292 Tucson AZ, M MadMopars pro stock
MadMopars pro stock M Joined: Jan 2003 Posts: 1,292 Tucson AZ,	Originally Posted By madscientist I have found 15 HP on a Strip Dominator. Care to share details? [img]https://s9.postimg.cc/6fbjxzfvv/48-2016-_Drag-_Weekend-_Best-_Burnouts-lpr.jpg[/img] 73 GTX 4407278 3/4 69 DART GT 4404 SPEEDDANA 73 ROAD RUNNER 4514 SPEEDDANA 64 F100 3834 SPEED9" 75 DODGE D300 4404 SPEEDDANA 99 DODGE RAM 3500 4X4 DUALLY... ON 38"s

Re: Holley Street Dominator modification [Re: MadMopars] #2234891 01/15/17 08:19 PM 01/15/17 08:19 PM
Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt. F fast68plymouth I Live Here
fast68plymouth I Live Here F Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt.	Originally Posted By MadMopars Originally Posted By madscientist I have found 15 HP on a Strip Dominator. Care to share details? I don't think there ever was a Strip Dominator for the RB motor. My guess is he's talking about a SB manifold. 68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads

Re: Holley Street Dominator modification [Re: fast68plymouth] #2234899 01/15/17 08:29 PM 01/15/17 08:29 PM
Joined: Jan 2003 Posts: 1,292 Tucson AZ, M MadMopars pro stock
MadMopars pro stock M Joined: Jan 2003 Posts: 1,292 Tucson AZ,	Originally Posted By fast68plymouth Originally Posted By MadMopars Originally Posted By madscientist I have found 15 HP on a Strip Dominator. Care to share details? I don't think there ever was a Strip Dominator for the RB motor. My guess is he's talking about a SB manifold. I see that word "strip" now. I know the "Street" Dominator can be improved with some work, just wasn't sure 15 HP was the number. [img]https://s9.postimg.cc/6fbjxzfvv/48-2016-_Drag-_Weekend-_Best-_Burnouts-lpr.jpg[/img] 73 GTX 4407278 3/4 69 DART GT 4404 SPEEDDANA 73 ROAD RUNNER 4514 SPEEDDANA 64 F100 3834 SPEED9" 75 DODGE D300 4404 SPEEDDANA 99 DODGE RAM 3500 4X4 DUALLY... ON 38"s

Re: Holley Street Dominator modification [Re: DGS] #2234909 01/15/17 08:56 PM 01/15/17 08:56 PM
Joined: Sep 2014 Posts: 4,457 Washington M madscientist master
madscientist master M Joined: Sep 2014 Posts: 4,457 Washington	Missed the BB part. If the top looks the same, there is some power there. The SD looks like it will take a TQ but it won't. So it isn't actually a spread bore intake or a square bore. Not sure how many of them I've done but it's over a dozen and it isn't 350 dollars worth of welding. Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

Re: Holley Street Dominator modification [Re: DGS] #2234930 01/15/17 09:56 PM 01/15/17 09:56 PM
Joined: Jul 2006 Posts: 619 nj J JAMESDART mopar
JAMESDART mopar J Joined: Jul 2006 Posts: 619 nj	i did mine a couple months ago and it weldeed like crap.

Re: Holley Street Dominator modification [Re: DGS] #2234941 01/15/17 10:20 PM 01/15/17 10:20 PM
Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt. F fast68plymouth I Live Here
fast68plymouth I Live Here F Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt.	I converted one for use with a 4500 carb in like 1990. I milled the perimeter of a piece of plate to be the same as the perimeter of the carb mounting pad, butt welded it all the way around. Then opened up the center to the size of a 4500 carb gasket and blended it, then butt welded the inside together as well, and blended/polished the weld down. It worked really well at the time. I tried it on a friends mid-10 second roller cammed 446 powered Cuda. He was running a TM7 with an 850dp on a 2" spacer. Did the swap at the track, this intake and an 1150 I had dialed in on another 446 on the dyno. Picked up like .25 and 3mph. He said it felt way better with this intake on the motor. It still just looked like a SD intake at the time, but a few years ago I thought I needed to make it look a little better, so I cut off a bunch of the extra "stuff" these manifolds have. I wasnt up for polishing out all the grinder marks, so I painted it. 68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads

Re: Holley Street Dominator modification [Re: DGS] #2234947 01/15/17 10:29 PM 01/15/17 10:29 PM
Joined: Sep 2014 Posts: 4,457 Washington M madscientist master
madscientist master M Joined: Sep 2014 Posts: 4,457 Washington	Some day, I'm going to do the same thing to a SB Strip Dominator. Almost did it this time but decided against it. Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

Re: Holley Street Dominator modification [Re: fast68plymouth] #2235059 01/16/17 01:00 AM 01/16/17 01:00 AM
Joined: Jan 2003 Posts: 1,292 Tucson AZ, M MadMopars pro stock
MadMopars pro stock M Joined: Jan 2003 Posts: 1,292 Tucson AZ,	Originally Posted By fast68plymouth I converted one for use with a 4500 carb in like 1990. I milled the perimeter of a piece of plate to be the same as the perimeter of the carb mounting pad, butt welded it all the way around. Then opened up the center to the size of a 4500 carb gasket and blended it, then butt welded the inside together as well, and blended/polished the weld down. It worked really well at the time. I tried it on a friends mid-10 second roller cammed 446 powered Cuda. He was running a TM7 with an 850dp on a 2" spacer. Did the swap at the track, this intake and an 1150 I had dialed in on another 446 on the dyno. Picked up like .25 and 3mph. He said it felt way better with this intake on the motor. It still just looked like a SD intake at the time, but a few years ago I thought I needed to make it look a little better, so I cut off a bunch of the extra "stuff" these manifolds have. I wasnt up for polishing out all the grinder marks, so I painted it. That's pretty cool piece. You still have it? Did you ever flow it for comparison? Last edited by MadMopars; 01/16/17 01:01 AM. [img]https://s9.postimg.cc/6fbjxzfvv/48-2016-_Drag-_Weekend-_Best-_Burnouts-lpr.jpg[/img] 73 GTX 4407278 3/4 69 DART GT 4404 SPEEDDANA 73 ROAD RUNNER 4514 SPEEDDANA 64 F100 3834 SPEED9" 75 DODGE D300 4404 SPEEDDANA 99 DODGE RAM 3500 4X4 DUALLY... ON 38"s

Re: Holley Street Dominator modification [Re: DGS] #2235141 01/16/17 02:59 AM 01/16/17 02:59 AM
Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt. F fast68plymouth I Live Here
fast68plymouth I Live Here F Joined: Jan 2003 Posts: 14,506 So. Burlington, Vt.	I still have it, and I probably flowed it at some point, but don't recall any of that info. It wouldn't flow as well as, or likely make as much power as a Victor with an adapter for a 4500. The benefit of this intake is it isn't all that tall(1-1/4" taller than a std SD), and retains the tipped carb pad. When I did this manifold, there werent any ootb manifolds for a bb mopar running a 4500 carb. It wasnt too long after I did mine that I saw the weiand team g 4500 became available. As I recall, when I did the first E head tests this piece was a bit better(6-8hp iirc) than an m1 4150 with a 2" adapter on it, when tested on a 600hp 448. 68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads

Re: Holley Street Dominator modification [Re: madscientist] #2235167 01/16/17 05:19 AM 01/16/17 05:19 AM
Joined: Mar 2005 Posts: 792 Earth R Rob C super stock
Rob C super stock R Joined: Mar 2005 Posts: 792 Earth	Originally Posted By madscientist The SD looks like it will take a TQ but it won't. So it isn't actually a spread bore intake or a square bore. Street or Strip Dominator? I have a "B" Street Dominator that is a spread and works with a TQ and the correct TQ gasket.

Re: Holley Street Dominator modification [Re: DGS] #2235270 01/16/17 01:37 PM 01/16/17 01:37 PM
Joined: Jan 2003 Posts: 4,296 Chicago, IL TonyS451 master
TonyS451 master Joined: Jan 2003 Posts: 4,296 Chicago, IL	I know Streetwize has done some modifications and testing on a street dominator intake. Maybe he will chime in and post some pics. I followed his suggestions and home modified one a few years ago. Most of the work was in the plenum area and blend into the runners. I never personally did any before or after testing, but the plenum area does have a lot of material that can be removed for a smoother shot to the runners. 2 kids and a dog

Re: Holley Street Dominator modification [Re: madscientist] #2235294 01/16/17 02:11 PM 01/16/17 02:11 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	Originally Posted By madscientist Not sure how many of them I've done but it's over a dozen and it isn't 350 dollars worth of welding. So you turn an out-of-the-box intake carb flange like the first pic into something like Hughes did in the 2nd pic? What do you charge for this type of job?

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