Author Topic: 440 motor intake manifolds Holley Street vs Edelbrock RPM (Read 2679 times)

gomangoRT/SE · « **on:** October 21, 2005 - 06:16:04 PM »

I think sometime in the past this has been brought about but I wanna rehash it again. I am going to be putting some finishing touches on a motor in the next few months. Car will only be occasionally hot rodded, mostly show and some street. The Holley Street Dominator seems to have same approx RPM range as the Edelbrock RPM manifold. <Which manifold do you prefer>? Application is for a 440 with close to 10 to 1 compression, Comp Cams XE274 with approx range 1800 to 6000. 906 heads with backcut valves stock 2.08s, mild porting, 3 angle valve job naturally, all new steel crank and rods with balanced rotating assembly. I will be putting a 800 cfm Carter Thunder series AVS or equivalant Holley.......(verdict still out on the carb). i will be running approx 2400 stall. More to the point of interest is this is an A/C, PS, PB car so I chose cam set up that i was assured would leave me enough vacuum for power accessories. Stock 3:23 gears. Isnt the Holley Street a single plane? I know the Edelbrock is a dual plane manifold which I like for lower RPMs while driving around. Again if you have experience with these manifolds and how they perform please chime in. My first Mopar rebuild in quite some years.

firefighter3931 · « **Reply #1 on:** October 21, 2005 - 07:06:19 PM »

For that mild of an application (cam/stall/gears) the dual plane would be my first choice. I had both of those intakes on a hot 446 street strip combo and we made back to back dyno pulls 30 minutes apart. That's about as good as it gets when doing a head to head comparison....or in this case manifold to manifold.

The engine has a big solid cam and 300cfm ported edelbrock heads, 10.5:1 compression. I can tell you that the engine did not like the performer rpm on the top end. It lost a bunch of hp up top....25hp at 6000 rpm. The rpm did make a bunch more torque down� below 3500 rpm though....it was 30 ftlbs better. So basicly you're trading torque for horsepower going to the street dominator from the peformer rpm. My car has 4.10's and 4200 stall so the loss of torque below 4k wasn't really a big issue for the application this engine was built for. In your case it would be with 2400 stall, 3.23 gears and small cam. Fwiw, the street dominator still made more peak torque than the rpm did but it came in much higher on the rpm scale. The SD closed the gap at 4000 and pulled away from the rpm and never looked back. The engine definately behaved differently with these two intake manifolds and the dyno pulls showed this in the resulting power curves...which were distinctly different.

Having seen the dyno numbers in black and white leads me to believe the rpm is better suited to a mild type combo with smallish cylinder head flow. The rpm was definately a restriction with a 300 cfm intake port and was choking this motor. Both are excellent manifolds in their own right.... but each has it's place in the pecking order of BB intake manifolds. If you had a street dominator on hand it would be worth running anyway with a 4-hole spacer to improve the bottom end power. If you didn't have either, the RPM would be where i'd be looking to spend my money for the reasons outlined above.

Ron

Chryco Psycho · « **Reply #2 on:** October 21, 2005 - 11:48:19 PM »

I lean the other way , the Street Dom works great , offers better hood clearance & with a 2400 stall the low end torque gain with the RPM would be mostly given away
either intake will work well

Author Topic: 440 motor intake manifolds Holley Street vs Edelbrock RPM (Read 2679 times)

gomangoRT/SE

440 motor intake manifolds Holley Street vs Edelbrock RPM

firefighter3931

Re: 440 motor intake manifolds Holley Street vs Edelbrock RPM

Chryco Psycho

Re: 440 motor intake manifolds Holley Street vs Edelbrock RPM