sam dupont
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After searching the advertising highway for a half hour, I give up. Question: Similar in design, how much better is the dp4b than an OEM 1966 four barrel?
dp4b vs 1966 intake
- Thread starter sam dupont
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lighter and cooler for starters.........ran one on a 383 in the day, I liked it
Runcharger
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Big improvement. WAG would be 20 HP.
Rusty knuckles
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I really like mine. Only part I don't like is I had to make a new brace for the AC compressor on my 69 charger. Dyno results on a mild motor is pretty crazy how well they perform against stock and modern aftermarket intakes. I'd do it if as long as you're not paying new modern intake price.
sam dupont
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$10 per horsepower gain is inviting. They look very much like a stock manifold, only slightly bloated. What is WAG?
Yes the DP has quite a bit more cross section than the very flat, small 64-67 intake.
WAG - wager a guess
Bee1971
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furious70
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What carb are you using?
Runcharger
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DP4B is superior to the new Performer.
lewtot184
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A bunch!
BSB67
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In what application?
Stock, wore out low performance 383, not much.
Fresh and warmed-up 383 with good heads, compression, street cam, and headers, quite a bit.
sam dupont
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I'm using the original 1966 AFB on a fresh stock motor with lightly ported 452 heads, 1968 HP exhaust, and a "383 Magnum" grind camshaft. It came with a standard cam (325 horse)
So, the larger runners hold a bigger charge even though it's sucked through the same size hole in the head?
So, the larger runners hold a bigger charge even though it's sucked through the same size hole in the head?
33 IMP
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Wild Assed Guess.
33 IMP
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In the app you described, I would 100% go with the Dp-4b. The stock manifold probably flows quite a bit less than your heads. I'd guess 20 plus horses better with the DP. (Paint it, grind the logo's off first, no one will know).
BSB67
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Hmmm. IDK. Maybe. I guess I see it maybe a bit differently though.
The details are so important on a 383. It is so easy to build a turd. Measured CR, and specifics as to the head work matter.
If it’s a true measured 9.5:1 CR, good heads (tight guides, straight valves, back cut, throat opened, and a competition vg) and 750+ carb and headers, probably 20+ hp. As you pull stuff out of the build, that number gets smaller pretty quick IMO.
furious70
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The old resto to rad articles on 383 and 440 showed power added at each step.
That 1966 afb is going to be the literal bottleneck however. I wouldn't pay big money for any non oem intake with that carb unless it's been worked by a stock class racer.
That 1966 afb is going to be the literal bottleneck however. I wouldn't pay big money for any non oem intake with that carb unless it's been worked by a stock class racer.
furious70
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You'll see 18hp for headers, another 12 for carb, another 40 for intake, and then another 49 for big cam.
Their m1 single plane is the wrong choice here of course along with the cam.
It would have been interesting to run the intake with the OEM carb as well.
Bee1971
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Add the Weiand Action Plus
My *** couldn’t tell any difference on the street
Along with just about any dyno numbers
BSB67
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