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I have a 1969 383 with 10:1 CR, 452 heads, and a 600CFM carb. The bigger summit cam and headers.

Not counting weight..is there any performance to be had with going to a Ebrock RPM or other after market intake? From what i read the stock intake isnt all that bad.

thanks.

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I have a 1969 383 with 10:1 CR, 452 heads, and a 600CFM carb. The bigger summit cam and headers.

Not counting weight..is there any performance to be had with going to a Ebrock RPM or other after market intake? From what i read the stock intake isnt all that bad.

thanks.

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Just depends on your intentions.

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If you look at the dyno test fast68plymouth did on his 383 the stock intake leaves about 40HP on the table vs. the RPM , no other changes .

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If you look at the dyno test fast68plymouth did on his 383 the stock intake leaves about 40HP on the table vs. the RPM , no other changes .

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Anyone have a link to that study?

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If you look at the dyno test fast68plymouth did on his 383 the stock intake leaves about 40HP on the table vs. the RPM , no other changes .

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Anyone have a link to that study?

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It's in the tech archive ...

This is the best I could find , alot got lost on the cutting room floor . I remember 40-50 HP with the intake change but that may have also been with the carb change to the carter 750 because I would have run that exact combo on my motor most of the time ??? , but the chart here is showing almost 26 ??? I read thru this real quick and didn't see that actual test and what Dwayne had to say .



383 dyno results

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If you look at the dyno test fast68plymouth did on his 383 the stock intake leaves about 40HP on the table vs. the RPM , no other changes .

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Anyone have a link to that study?

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It's in the tech archive ...

This is the best I could find , alot got lost on the cutting room floor . I remember 40-50 HP with the intake change but that may have also been with the carb change to the carter 750 because I would have run that exact combo on my motor most of the time ??? , but the chart here is showing almost 26 ??? I read thru this real quick and didn't see that actual test and what Dwayne had to say .



383 dyno results

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Thanks john.
I read that but it looks like they cut out the intake comparisons and focused on the carbs.

im reluctant to buy stuff that wont swap over to my 440..i guess ill just keep a eye out for a used RPM.

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I'm guessing now after reading it all it was the intake carb combo that gained the HP I remember . The big thing is his cam and headers do also make a difference in the grand scheme of things . I have an RPM in my pile o'intakes for a low deck , hopefully I get it on a running engine this year

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I realize the benefits of an aluminum manifold but I am looking for creativity with what Ma Mopar gave us. I'm curious about how much port matching would help, also what difference would it make to mill down the plenum dividers? Are there other "tricks" such as air dams that would make a difference? I'm the type of person that likes to optimize what I have before moving on.

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If you look at the dyno test fast68plymouth did on his 383 the stock intake leaves about 40HP on the table vs. the RPM , no other changes .

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Anyone have a link to that study?

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It's in the tech archive ...

This is the best I could find , alot got lost on the cutting room floor . I remember 40-50 HP with the intake change but that may have also been with the carb change to the carter 750 because I would have run that exact combo on my motor most of the time ??? , but the chart here is showing almost 26 ??? I read thru this real quick and didn't see that actual test and what Dwayne had to say .



383 dyno results

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Hughes Engines does studies on the various Mopar
SB and BB intakes, usually to improve on the
flow characteristics. They seem to be on the right
track with the Eddy RPM for the 383.

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High Performance Mopar magazine did an article on this in their 65 Coronet 500 that they had a 383 magnum motor in. I think they had a stock intake and manifolds, then extrude honed them and got about 5HP. Then went to an Eldebrock and got huge gains. Something like high 13's with a stock magnum exhaust system (compared to mid-low 14's)

I'm sure the Dp4b and the Weiand 8008 are better choices and look stock. The 8008 has a stock coil location, where the DP4B is righ in front of the carb. Which is in the way for my stock 70 Holley.

Maybe a 72 T-quad would be a better improvement?

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Could be. the TQ offers a bit more torque in the
lower rpm's as well as better fuel atomization/
fuel efficiency. The key is the multi-venturi
primary barrels. The carb can also be made to scream too, since they are legal for the Super
Stock/Stock Eliminator classes. A TQ Strip Kit,
some time + some patience = fast fun/good times

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Definately worth an upgrad to the performer RPM, plus a larger CFM carb. Do you have hood clearance for it?

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High Performance Mopar magazine did an article on this in their 65 Coronet 500 that they had a 383 magnum motor in. I think they had a stock intake and manifolds, then extrude honed them and got about 5HP. Then went to an Eldebrock and got huge gains. Something like high 13's with a stock magnum exhaust system (compared to mid-low 14's)

I'm sure the Dp4b and the Weiand 8008 are better choices and look stock. The 8008 has a stock coil location, where the DP4B is righ in front of the carb. Which is in the way for my stock 70 Holley.

Maybe a 72 T-quad would be a better improvement?

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Try the one off of the 72 400 Magnum (approx. 800
cfm)and jet it appropriately. Air door adjustment is a big help.