SB Strokers and 950 carbs??? - Moparts Forums

Register Log In Moparts Forums Unlawfl's Race & Engine Tech SB Strokers and 950 carbs???

Print Thread

SB Strokers and 950 carbs??? #516688 11/05/09 02:04 PM 11/05/09 02:04 PM
Joined: Feb 2005 Posts: 2,679 owt west Thread Ender1 OP master
Thread Ender1 OP master Joined: Feb 2005 Posts: 2,679 owt west	Im in the process of doing a 410" SB and have most of the parts, i will be picking the heads up tommorow with flow figures the only drawback is the are the RhS 360 X heads with the max valve lift flaw. Im only going to be running approx .550" and unsure of what duration figures. I think its going to be maybe a stock elim profile. I could list more details. The question is it seems these 4" strokers work well with a 950 carb, will that be the case for my combo.

Re: SB Strokers and 950 carbs??? [Re: Thread Ender1] #516689 11/05/09 02:13 PM 11/05/09 02:13 PM
Joined: Jan 2003 Posts: 31,002 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,002 Oregon	Depends on the application. Are you talking about a 950HP type of carb? Those are usually 750 main bodies with the choke housing removed. They are nice carbs but the venturi is smaller than a 850 DP. That might be exactly what you need or it might not, depends on the application. I'm going to use a 650 HP on my SB stroker. This motor is 427 inches with Hughes Stage III ported heads. Bigger isn't always better and all of that you know.

Re: SB Strokers and 950 carbs??? [Re: AndyF] #516690 11/05/09 02:15 PM 11/05/09 02:15 PM
Joined: Feb 2005 Posts: 2,709 NJ central S Scamp408 master
Scamp408 master S Joined: Feb 2005 Posts: 2,709 NJ central	How bout an 825 demon

Re: SB Strokers and 950 carbs??? [Re: AndyF] #516691 11/05/09 02:26 PM 11/05/09 02:26 PM
Joined: Feb 2005 Posts: 2,679 owt west Thread Ender1 OP master
Thread Ender1 OP master Joined: Feb 2005 Posts: 2,679 owt west	Quote: Depends on the application. Are you talking about a 950HP type of carb? Those are usually 750 main bodies with the choke housing removed. They are nice carbs but the venturi is smaller than a 850 DP. That might be exactly what you need or it might not, depends on the application. I'm going to use a 650 HP on my SB stroker. This motor is 427 inches with Hughes Stage III ported heads. Bigger isn't always better and all of that you know. I was meaning the holley 950 hp, I know i know, thats what the guy who is doing the heads said also. i will post cam specs and head figures tommorow, just thought id ask, because i hope to get this project going soon.

Re: SB Strokers and 950 carbs??? [Re: AndyF] #516692 11/05/09 02:32 PM 11/05/09 02:32 PM
Joined: Aug 2003 Posts: 11,179 Atco NJ DJVCuda I Live Here
DJVCuda I Live Here Joined: Aug 2003 Posts: 11,179 Atco NJ	Quote: Depends on the application. Are you talking about a 950HP type of carb? Those are usually 750 main bodies with the choke housing removed. They are nice carbs but the venturi is smaller than a 850 DP. That might be exactly what you need or it might not, depends on the application. I'm going to use a 650 HP on my SB stroker. This motor is 427 inches with Hughes Stage III ported heads. Bigger isn't always better and all of that you know. Holley list 80675 ( 750 ultra hp ) has a venturi size of 1.376" with a throttle bore of 1.688" Holley list 80676 ( 950 ultra hp )has a venturi size of 1.376 with a throttle bore of 1.750" While the main bodies are the same ( ie the venturi size) the baseplate is larger resulting in more overall CFM flow. This is one area where a dyno will not accurately tell you what your car will do on the track, you are not launching the car onthe dyno, where one carb will pull the number on the dyno, that same carb might be a pig onthe car at the track. In testing, most have found the more carb you throw at a small block stroker the happier they are! My tests have backed that up with small block stock strokes, strokers, and big block strokers. Last edited by DJVCuda; 11/05/09 02:33 PM.

Re: SB Strokers and 950 carbs??? [Re: DJVCuda] #516693 11/05/09 03:11 PM 11/05/09 03:11 PM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	If the main body is the same, couldn't a guy just get a 950 base plate and convert his from 750 to 950 specs? Metering blocks different? -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: SB Strokers and 950 carbs??? [Re: Triple Threat] #516694 11/05/09 04:05 PM 11/05/09 04:05 PM
Joined: Jan 2003 Posts: 11,710 Portage,michigan B B3422W5 I Live Here
B3422W5 I Live Here B Joined: Jan 2003 Posts: 11,710 Portage,michigan	I would bet a pretty darn good amount of money that stroker mentioned above with a decent sized cam will continue to ET better with each increase in carb size from 650 to 750 to 950, and perhaps even beyond in size, depending on a couple of other factors.It will easily run its worst ON THE TRACK with the 650. Zero doubt about it. I have ( in a single day) track tested a pro systems 750, pro systems 1000, race demon 1025 and a 1100 pro systems dominator on a eddie headed 416 without a ton of compression( 12 to 1 ish)...the fastest two carbs were the 1025 rs race demon and the dominator, and it wasnt even close.The 1025 being 8 hundreds better than patricks 1000 hp surprised me a little. Thanks to Patrick for allowing me to use the carbs, i bought the dominator and still have it, and sold the 1025 a short while later on Moparts. 69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8

Re: SB Strokers and 950 carbs??? [Re: B3422W5] #516695 11/05/09 08:36 PM 11/05/09 08:36 PM
Joined: Jul 2006 Posts: 383 Essex, Ont., Canada Fishmarket enthusiast
Fishmarket enthusiast Joined: Jul 2006 Posts: 383 Essex, Ont., Canada	How does the 950 compare to the 850 having a larger venturi and what could you expect with these carbs on the street? 1972 Plymouth Cuda 340 4 speed 1971 Plymouth Road Runner 383 Auto 1970 Plymouth Duster /6 Auto

Re: SB Strokers and 950 carbs??? [Re: Fishmarket] #516696 11/05/09 09:08 PM 11/05/09 09:08 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: How does the 950 compare to the 850 having a larger venturi and what could you expect with these carbs on the street? Smaller carbs have a faster reaction on the street (better throttle response) but lack on top end almost every time... RPM has a big factor on the size of the carb... I run a 1050 dom on a 405ci but turn it 8200... if I had a bigger carb I'd run that

Re: SB Strokers and 950 carbs??? [Re: MR_P_BODY] #516697 11/06/09 08:12 PM 11/06/09 08:12 PM
Joined: Dec 2004 Posts: 1,489 St. Louis Mo. 10 o to go "Happy Don"
10 o to go "Happy Don" Joined: Dec 2004 Posts: 1,489 St. Louis Mo.	I had holley 950 HP alky i think thier now .Finally had it flowed 722 cfm wet benched .Had a 950 aresol billet built By C&S Try 850 to 1050 as most said 850 is bigger . Don 2009 418" build dan smith built new 9.96 131.82 6.23 108 1.30 60 foot best to date 9/15/09 8in 727 430 dana 2860 lb 3040 lb w driver

Re: SB Strokers and 950 carbs??? [Re: 10 o to go] #516698 11/06/09 08:53 PM 11/06/09 08:53 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	We ran a 950 hp on a w5 headed 414, went to a 1050 dom and picked up a half second, major difference in top end performance,Have a bg 1000 that works good also,

Re: SB Strokers and 950 carbs??? [Re: Thread Ender1] #516699 11/06/09 09:37 PM 11/06/09 09:37 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	Speaking of Holleys size, where does the 830 downleg HP fit? I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: SB Strokers and 950 carbs??? [Re: HotRodDave] #516700 11/06/09 09:51 PM 11/06/09 09:51 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	I'm running a 750 annular booster mighty demon on my 408 - 11.2:1, big hydraulic (256 and a little over .600 lift). Runs good, but I'm wondering if a bigger carb would help? Heavy automatic car. Fastest 300

Re: SB Strokers and 950 carbs??? [Re: B3422W5] #516701 11/07/09 08:28 AM 11/07/09 08:28 AM
Joined: Aug 2004 Posts: 293 Michigan C ccarson enthusiast
ccarson enthusiast C Joined: Aug 2004 Posts: 293 Michigan	I have pro systems 4150 based 1000s, I wish I would have bought one of his Dominator's for my 420" W9, especially when i saw the size of the wilson spacer we decided to put on the intake.

Re: SB Strokers and 950 carbs??? [Re: B3422W5] #516702 11/07/09 04:42 PM 11/07/09 04:42 PM
Joined: Dec 2003 Posts: 22,696 Bitopia J jcc If you can't dazzle em with diamonds..
jcc If you can't dazzle em with diamonds.. J Joined: Dec 2003 Posts: 22,696 Bitopia	Quote: It will easily run its worst ON THE TRACK with the 650. Zero doubt about it. Not putting words in anyones mouth, but I think the SB stroker AndyF is mentioning is for a road race application, and crisp throttle response is therefore highly valued, and since I am building an almost identical SB Stroker motor and application, I am leaning towards a 750? since we are usually traction limited and most passing takes pplace at the top end. Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.

Re: SB Strokers and 950 carbs??? [Re: jcc] #516703 11/07/09 06:15 PM 11/07/09 06:15 PM
Joined: Feb 2005 Posts: 982 western pennsylvania b1dartsport super stock
b1dartsport super stock Joined: Feb 2005 Posts: 982 western pennsylvania	I run a 1050 race demon RS on my 408 Indy head pump gas street strip Dart sport. I change the boosters from downleg to annular on the street which actually changes the carb to a 950. It runs really nice on the street & has exellent throttle response for a 260/266 @.50 solid roller. It has gone 9.87 at 136 with the downleg boosters in. I have not run it at the track with the annulars but I think the motor is alot smoother with them, has way better tip in & it does not give up much power.

Re: SB Strokers and 950 carbs??? [Re: b1dartsport] #516704 11/07/09 06:32 PM 11/07/09 06:32 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	The annular boosters are very responsive compared to the down legs, may be the ticket in a road race rig or street rig

Re: SB Strokers and 950 carbs??? [Re: jcc] #516705 11/08/09 02:28 AM 11/08/09 02:28 AM
Joined: Feb 2007 Posts: 1,025 Las Vegas, NV dodgeboy11 super stock
dodgeboy11 super stock Joined: Feb 2007 Posts: 1,025 Las Vegas, NV	if traction is limited, would not a larger carb to soften the lower speed hit not be a positive? It'd hit the tires less and you'd have more top end charge. Just a thought.

Re: SB Strokers and 950 carbs??? [Re: dodgeboy11] #516706 11/08/09 09:11 AM 11/08/09 09:11 AM
Joined: Aug 2003 Posts: 11,179 Atco NJ DJVCuda I Live Here
DJVCuda I Live Here Joined: Aug 2003 Posts: 11,179 Atco NJ	the testing i have shows a better incremental all around from larger carbs - from 60' on -

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1