Are there any performance differences in these two intakes on a mild 440? I currently have an RPM on my motor and would like to go to the SD for added hood to air cleaner clearence. Anybody know how much shorter a SD is than a RPM?

Thanks,

The SD is probally one of the best intakes made for a BB.I believe its about 1 inch shorter.The one I had on my 440 fits under the hood on my kids 62 300.Rocky

They say the SD is a little softer in the bottom end and a lil stronger in the top end than the RPM. But the difference is supposed to be pretty minimal.

I run the street dominator with a 1" spacer and it fits under the hood of my 63 with no problems. It fit fine even when I had the flat hood on it. And the street dominator works great. It has good low eng and top end. My 63 goes 3700 lbs and has hit a 1.57 best 60 which is repectable for a mid 11 car. My son has the RPM on the 400 in his Dart and he loves it also. We ran a street dominator on his 400 and compared the two intakes. He went 11.59 @ 117 with the SD and 11.55 @ 116 with the RPM. The RPM was a tad better down low but the SD had more mph. Very close.
Here is the SD on my 440 in my 63. Ron

Wow, Thanks for all the great input here guys! I really appreciate it. What are the particulars on your build 383man?

Is the Holley 300-14 the Street Dominator everyone is talking about that you can still buy new? For some reason I thought they were discontinued and you had to find a used one?

300-14 Street Dominator

I really like the Holley Street Dom intake; very good/even fuel distribution and fuel atomization. Work great with spread-bore or square-bore carbs!

I have this one on my stock '68 440 non hp with TTI 2" headers and 727 trans with stock low stall converter. Was running a 3.91 SG and it would
light-the-tires but switched to a 2.94 SG and it will still light-the-tires! Lost of low end power with my '70 Comp 850 T.Q. carb.

A lot of these engines are not "mild"! Go with the RPM.

Alright want some real numbers go to moparmusclemagazine {tech articals} under Intake Exstravaganza.

I don't have a comparison but I have a SD on my 496 so as to use the stock hood. The egine made 636.9 pounds of torque at 4300 rpm and 567 hp at 5400 RPM. This manifold works.

Yes the intake works.However on a mild 440 I would opt for the added low end grunt of the dual plane rpm.ANother place where the rpm is likely better on a mild motor(or in a heavy car with mild gearing)is part throttle response.You see a lot of part throttle on the street.
I am a big fan of the intake(I have run it on my 496 and my 465),just not on stockish builds with medium gears and full weight cars.

30 years ago I took a two bbl off of a 400 in a van and put the street dominator on it with a holley spread bore 650 VS and it was like adding 100 cu inches!
It really worked on it, mileage went up, drivability too. Tire wear did suffer though!!!
I could get 17 mpg instead of 14, and spin tires at 30 mph punch.

Small plenum single planes work well on even mild engines. The big block SD is the best of them. An original advertisement for the Torker 440 claimed the "New" (1974 ad) Torker single plane manifold when bolted on to the emissions choked Dodge and Plymouth big blocks brought back some of that lost power. Then the add went on to say if you bolted the Torker to a 67-71 engine..."WOW!"

Here is my build that I am calling mild:
• 71 440
• Stock rods and crank
• TRW Forged Flattops; approx. 10:1 Static Compression ratio
• Out of the box Edelbrock RPM heads (84cc)
• Stock style rocker gear
• Comp XE285HL Cam, comp lifters,
• RPM Intake
• 750 Speed Demon Carb
• MP Electronic Ignition
• Doug’s 2” Full Length Headers
• 3” Magnaflow bullet mufflers out the side like a AAR currently, coming a 2 ½ “ X-pipe exhaust system. Current system way too loud.
• 833 4-speed
• 8 ¾” rear 3.91 sure grip
• 275/60-15 rear tires (28” tall)

I may eventually change the cam to a bit smaller one to get better idle characteristics. Thinking on the Luntai 60303. Also may add a BIGS 850 DP or Proform 850 DP. Other than that, this is what I have. The RPM, because of height and stock hood, limits me on air cleaner space. If I would not be doing anything stupid to rob me of significant bottom end, then I would like to change to the SD.

Thanks,

I would put an SD on that combination in a heart beat. You will not be disappointed.

That combo will run good on the street, especially with the 750 carb. If you want to make the most of the SD single plane, Eddy heads, and 2" headers however, which all will allow a 440 to breath north of 6k, you may want to think about a bigger carb. The 750 will likely start costing you power at around 4500 - 5000. But as said, it will likely run crisper around town than an 850 would.