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1970 Charger 383 Factory Correct 2V to 4V Conversion

king nicky

king nicky

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Im sure this topic has been beaten to death, ive spent hours researching inconclusively, what i need to convert a 1970 Charger 383 2v auto to 4v and appear correct as possible, ive spent months doing metal work and am looking for a fun little project change.

What I know is required:
- dual snorkel 1970 air breather
- intake 666
- LH exhaust manifold 2899879 ( RH 2951865 already there)
- Carter AVS 4736

What i dont know:
- was there a pie tin?
- were the 330s all orange or some blue?
- anything else, clutch fan, carb linkage etc?

I apologize for my lack of knowledge, my last mopar was a 69 fury III in the 80s.

Screenshot_2017-07-21-12-12-51.png
 
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PurpleBeeper said:
I believe the 330hp 383's were blue, but the HP 383's w/335hp were orange in 1970
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Hi, thanks for replying, im still learning, most pics i see of 70 383 4 barrel engines seem to be orange, i was under the impression only two 383 options were available in 70 chargers, 290 and 330, and the 335 was available in other mopars?
Thanks again
 
PurpleBeeper said:
I believe the 330hp 383's were blue, but the HP 383's w/335hp were orange in 1970
- looks like you did get a pie tin
- not sure, but your carb linkage is likely different & you may still be able to use your 2 bbl. throttle cable.
https://www.bing.com/images/search?view=detailV2&ccid=Y9zbeW5q&id=B5CB991A63BB7382DD5727A077F37C4A15DD0970&thid=OIP.Y9zbeW5qebAOP7GwqCbFBQHaFj&mediaurl=http://car-from-uk.com/ebay/carphotos/full/ebay875475.jpg&exph=800&expw=1066&q=1970+charger+383+engine+pictures&simid=608054766351221403&selectedIndex=1&qpvt=1970+charger+383+engine+pictures&ajaxhist=0
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At least in 1970 Roadrunners (no 2 bbl. option), I think you got a blue 330hp 383 with air conditioning & an orange 335hp 383HP without A/C.

For what it's worth... I think the 383 2bbl. motors also got the milder "non-HP" camshaft, which I think is the '67 & older camshaft. The heads are the same.
 
I don't know if you have auto-trans, but if you do, check the kick down assembly.
 
In my experience the 2 BBL Cam Engines, do not respond well performance-wise to the addition of a 4 BBL Intake/Carb.

If "appearance" is all you seek then so be it..... just don't have expectations of any real "performance" boost ?
The 2 BBL Cam typically does not even produce enough low pressure to even open the 4 BBL's much, if at all ? That's the "drone" sound you hear with 4 BBL's.... probably won't hear it because they ain't there much.
 
Challenger340 said:
In my experience the 2 BBL Cam Engines, do not respond well performance-wise to the addition of a 4 BBL Intake/Carb.

... just don't have expectations of any real "performance" boost ?
Click to expand...

Interesting Bob. My experience is quite different. Back in the 70s when me and my friends all got our our first cars a few of them were 383 2 bbl cars, one a Ford 390 2bbl. We were all gear heads and went to Milan regularly. Theses 2bbl cars were 16 sec cars and ran in the low 80 mph range With factory carbs, intakes and dual exhaust from the junk yard hey were 15.3 cars at almost 90 mph. The difference was surprising. Of course, the factory 4bbl cars w 4bbl cams were running in the 14s.

The other thing that was surprising was when we started doing more things. Holley carbs, then bigger Holley carbs, then one guy added headers. No matter what we did, they were still low 15 cars. That seemed to be the limit for the cam and compression ratio.
 
BSB67 said:
Interesting Bob. My experience is quite different. Back in the 70s when me and my friends all got our our first cars a few of them were 383 2 bbl cars, one a Ford 390 2bbl. We were all gear heads and went to Milan regularly. Theses 2bbl cars were 16 sec cars and ran in the low 80 mph range With factory carbs, intakes and dual exhaust from the junk yard hey were 15.3 cars at almost 90 mph. The difference was surprising. Of course, the factory 4bbl cars w 4bbl cams were running in the 14s.

The other thing that was surprising was when we started doing more things. Holley carbs, then bigger Holley carbs, then one guy added headers. No matter what we did, they were still low 15 cars. That seemed to be the limit for the cam and compression ratio.
Click to expand...

I used to have a spec sheet of the factory Cams, but I can't seem to find it right now ?
It showed the Cam lobe differences between the factory 2 BBL/4 BBL and 4 BBL Magnum Cams, and it would be handy right now for illustration of "potential" ?

If you guys track tested certainly can't argue with that Russ.
all I know is that back in the day we tried it/helped guys on numerous occassions with factory 383 2 BBL cam engines swap to 4 BBL Intakes/Carbs/even Headers/Duals etc., even went as far a few times swapping out the single V/Springs for the Magnum Single/damper units to try and extend the 2 BBL Cam range.
and well....
our experience with it "best" described, as a marginal improvement at most ? and for all practical purposes we eventually relegated it to a "waste of time" akin to "1/2 a job done".
We got to the point, that the 383 2 BBL Cammed Engines swapped 4 BBL's/Headers/Duals just didn't respond sufficiently in our opinion(seats of pants) to make customers happy, and even worse when the Customers themselves still got their doors blown off by stock/untouched RR's W/factory 335hp 383's/HP Manifolds.
So we quit doing it period without a Cam swap.

Conspicuous for me in those days, and this sounds "hokey" I know....
but I could tell right away when riding in the 2 BBL Cammed Engines swapped to 4 BBL Cam/Intakes, was the lack of the 4 BBL "sound" in the Car when romped on ?
You know... that "drone" sound the 4 BBL makes through the unsilenced Air Cleaner when tasked ? It just wasn't "there" on the 2 BBL Cammed 4 BBL swap Engines like the 335 hp 4 BBL Cammed Engines.
Pretty disappointing that missing 4 BBL "sound" after the swap onto 2 BBL Cammed Engines ?

No wars wanted,
just trying to add clarity to expectations.
 
Challenger340 said:
I used to have a spec sheet of the factory Cams, but I can't seem to find it right now ?
It showed the Cam lobe differences between the factory 2 BBL/4 BBL and 4 BBL Magnum Cams, and it would be handy right now for illustration of "potential" ?

If you guys track tested certainly can't argue with that Russ.
all I know is that back in the day we tried it/helped guys on numerous occassions with factory 383 2 BBL cam engines swap to 4 BBL Intakes/Carbs/even Headers/Duals etc., even went as far a few times swapping out the single V/Springs for the Magnum Single/damper units to try and extend the 2 BBL Cam range.
and well....
our experience with it "best" described, as a marginal improvement at most ? and for all practical purposes we eventually relegated it to a "waste of time" akin to "1/2 a job done".
We got to the point, that the 383 2 BBL Cammed Engines swapped 4 BBL's/Headers/Duals just didn't respond sufficiently in our opinion(seats of pants) to make customers happy, and even worse when the Customers themselves still got their doors blown off by stock/untouched RR's W/factory 335hp 383's/HP Manifolds.
So we quit doing it period without a Cam swap.

Conspicuous for me in those days, and this sounds "hokey" I know....
but I could tell right away when riding in the 2 BBL Cammed Engines swapped to 4 BBL Cam/Intakes, was the lack of the 4 BBL "sound" in the Car when romped on ?
You know... that "drone" sound the 4 BBL makes through the unsilenced Air Cleaner when tasked ? It just wasn't "there" on the 2 BBL Cammed 4 BBL swap Engines like the 335 hp 4 BBL Cammed Engines.
Pretty disappointing that missing 4 BBL "sound" after the swap onto 2 BBL Cammed Engines ?

No wars wanted,
just trying to add clarity to expectations.
Click to expand...

We might be closer on this than you think, Bob. Low 15s is not really good (but better than 16.) and short of the performance of the factory 330 and 335 cars. But it's relative. I think the factory 2bbl and intake sucked a lot of snot out of those motors. I think our opinions differ slightly on how weak the 2bbl was. :thumbsup:
 
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Many posts I read say that the same camshaft was used in the 383 ,2v,4v, and 440 LP, and if I'm not mistaken heads as well, I will be changing it anyway, Compcams has interesting suggestions using its app.
The 2v carb CFM is very low, correct me if wrong, 275, in my opinion the bottleneck.
I've performed simple intake/carb 2v to 4v on a chev 350, and recently on my 351C Mustang and both were noticable in late rpm.
Thanks for the interesting comments.
 
2V cam was .425/.437 I believe. Only 32 degrees overlap. The 330 hp engine used the same cam. There was also the .431/.443/32 degrees on the 1968 Super Commando 383 engines.
 
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You will also need to change the throttle cable, cable bracket and carb kick down rod to 4bbl pieces for correct adjustment if using original factory intake/carb
 
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