383hp/383

[almx33]

what is the difference from a383hp motor to astandard 383

 

[court9155]

Pistons and valvesprings are the only INTERNAL differences that I see with my OWN eyes on my 1968 2 barrel non hp motor versus my 1969 4 barrel hp motor.

I have yet to measure the camshafts so I cannot speak with FIRST hand knowledge, not just **** I read in a book.

Others will chime in Iam sure.

Dan

 

[696pack]

Pistons and valvesprings are the only INTERNAL differences that I see with my OWN eyes on my 1968 2 barrel non hp motor versus my 1969 4 barrel hp motor.

I have yet to measure the camshafts so I cannot speak with FIRST hand knowledge, not just **** I read in a book.

Others will chime in Iam sure.

Dan

You have thrown a 3rd wngine in the mix here. The 383-2 and the 383-4 are the same engine except compression, carb and intake. The difference between a 4 barrel standard and the HP are the exhaust manifolds, cam and windage tray. There are no differences in valve springs or heads, they all use the same heads as the 440s.

 

[Meep-Meep]

Distributor advance curve also is different.

 

[court9155]

You have thrown a 3rd wngine in the mix here. The 383-2 and the 383-4 are the same engine except compression, carb and intake. The difference between a 4 barrel standard and the HP are the exhaust manifolds, cam and windage tray. There are no differences in valve springs or heads, they all use the same heads as the 440s.

I didnt realize he meant the non hp 383 4 barrel motor.

I thought he was asking about a 2 barrel versus 4 barrel motor.

 

[Meep-Meep]

Actually from my observation over the last 30 yrs I can say the valve springs between the non HP and HP engines are different. HP engines had surge dampers and fewer coils than the non HP engines. Non HP springs were green in color I believe. Heads and valve sizes ARE the same.

 

[court9155]

Here is what I know, first hand. Yes I guess I am throwing a 3rd engine into the mix if the OP is asking about a standard 4 barrel 383 versus a hp 383 and not a 2 barrel motor..

I have one that hasnt been touched. I can take pics and speak with real world first hand knowledge. I have a 69 330 horse motor. It had a dual snorkel air cleaner, hp c body manifolds, avs carter. No air conditioning. It was out of a c body.

It does not have any different valve springs than the 2 barrel 1968 383 2 barrel motor that my uncle (meep meep) gave me.

I did pull one head off of both motors and they have different pistons. The 69 motor is at nearly 20 thousandths to deck. The 383 motor has a weird dish.

Sorry for the confusion.....

 

[696pack]

Actually from my observation over the last 30 yrs I can say the valve springs between the non HP and HP engines are different. HP engines had surge dampers and fewer coils than the non HP engines. Non HP springs were green in color I believe. Heads and valve sizes ARE the same.

I stand corrected.

I do know there is no difference in the springs from a 383-2/290 and a 383-4/330. It stands to reason there may be a difference in the 383-4/335 as it is a higher lift cam.

 

[RustyRatRod]

The 383 HP has more power. That's the difference.

 

[court9155]

The 383 HP has more power. That's the difference.

To put it bluntly, yes.

 

[RustyRatRod]

To put it bluntly, yes.

Is there any other way? lol

 

[almx33]

almx33 383hp 4 bl /383non hp

what is the difference from a383hp motor to astandard 383

thanks 4 info i just found a1969 dodge coronet in a barn in wis. motor is stuck and when i took it apart all vaives were rusted and broke laying on top of pistons. i would like to save the block and crank so if i were to find parts thats why i asked ? about the difference.is the reg 383 the same same block and crank as the hp 383 4 bl that is what the car has. it is also a convertable

 

[Budnicks]

what is the difference from a383hp motor to astandard 383

Probably already covered... Depending on what year & configuration of course, about 45HP or more HP differences, 68-70ish 290hp 383ci 2bbl vs 335hp/383HP 4bbl Road Runner & Super Bee engines w/268* 0.450"/0.460" ball park camshafts, windage tray & 383/440HP 68-70 HP-Exhaust Manifolds 2-1/4" exhaust with H-pipes & 4bbl Carter AVS/AFB's, there were 330hp versions in Cuda's & Chargers too.... There were early tall deck 383's also, even some with 2x4bbls 383's too....

 

[69Coronetrt]

If you are talking about the 68-70 335 horse B body variation, the differences are:

Cam
valve springs
windage tray.

Carbs vary by year and application but, generally speaking, the AVS was used in 68 and 69 and the Holley in 70.

The intake and exhaust manifolds are the same as a 330 horse version. There are no "HP" exhaust manifolds, they are either the 2bbl or 4bbl style.

 

[Cranky]

My 70 Challenger 4 barrel car (non RT) came with 383 330 horse engine. It had the AVS carb and dampers on the valve springs, the 'big' exhaust manifolds and dual exhaust. It never did run anywhere like a 383 Magnum Challenger even with removing the 3.23's and installing 3.91 gears and tuning it for better performance.

 

[RustyRatRod]

I'm lost. Wasn't the 383 Magnum rated at 330 HP as well? You make them sound like two different engines. Am I missin somethin?

My 70 Challenger 4 barrel car (non RT) came with 383 330 horse engine. It had the AVS carb and dampers on the valve springs, the 'big' exhaust manifolds and dual exhaust. It never did run anywhere like a 383 Magnum Challenger even with removing the 3.23's and installing 3.91 gears and tuning it for better performance.

 

[Cranky]

IIRC, the 383 Magnum was rated at 335 in 1968 through 1970.

 

[RustyRatRod]

IIRC, the 383 Magnum was rated at 335 in 1968 through 1970.

Ok. I'd like to see what a blueprinted to the nth degree 383 Magnum would do. With the deck height where it's supposed to be, instead of like .060" high on one side and .072" high on the other. Head chambers blueprinted to spec, cam degreed in...all that stuff. Get everything where it's supposed to be. There'd be a lotta tire smoke.

 

[theman440]

Don't forget the earlier 325 Horse 383 4-bbl

 

[Cranky]

Don't forget the earlier 325 Horse 383 4-bbl

What year are you talking about? 66-67?