for a stroked bbc with iron heads roller cam i have a dart intake single plane but it seems a dual plane would be better what kind of experince do you guys have on the dyno with these 2 styles of intakes never will see over 6000 rpm please help trying to get the most out of my setup

The HP500's use a Dart single plane and that is what I am using.

I use edelbrock torker 2 single planes mostly due to deck clearance. Works fine over 2000 rpm.

what heads are you runing.and what kinda flow# on the heads .does the intake flow more cfm then the heads. darts are one of the best intakes out of the box

i have stock rect port iron heads dont have any flow numbers but was thinking of putting larger vavles in should i or shouldnt i thanks bo

if you are building motors i would chang to aftermarket heads flow is power

cant afford heads thats why i was wondering if the larger vavles would help

The Dart is the best out of the box manifold for the price out there right now. I'd keep it.

If you ever do any other upgrades, like heads, etc. later you're already set with your intake.

DAVE

If you will never see 6,000, a good dual plane intake will improve low end a lot and improve most numbers up to 5,000-5,500.
Bigger valves here will not help much. Good pocket port will show more gain. Also, notch the block-it really does work!!
If you will send me your cam specs, I will try to be more specific on what I think you should do.

hey blown 1500 rember when i told you about my cam you were right i called comp cams today they said they would take care of it under warranty preety cool they also said when using an after market fuel pump to use a bronzed tip push rod again just like you said my cam specs are intake .591 exh .601 dur a .50
intake 222 exhaust 230 at 112 lobe sep hope you can help bo
also the block is bore notched