383 stock engine help

[bobfist]

Hi!

I have my factory stock 440 magnum in my charger 69 rt
but now im going to restore my RR 71 and need some help with information
I just got my hands on a stock 69 RR 383 engine the closest i came to my 71 , anyway it came from a RR

But now i need to know how this engine was built compare to the 69

I know the heads where diff, intake manifold and , ex manifolds pistongs 8:5:1 anything else inside ?

[cudaken]

Hi!

I have my factory stock 440 magnum in my charger 69 rt
but now im going to restore my RR 71 and need some help with information
I just got my hands on a stock 69 RR 383 engine the closest i came to my 71 , anyway it came from a RR

But now i need to know how this engine was built compare to the 69

I know the heads where diff, intake manifold and , ex manifolds pistons 8:5:1 anything else inside ?

Far as rotating mass you are good to go. They are both forged cranks, internal balanced motors and pretty sure the same rods where used, I think YL casting

Funny, you have a 69 Road Runner engine for your 71 Road Runner, and I have a 71 Road Runner engine in my 68 Road Runner. 68 and 69 Road Runner engines where the same. But, I also still have my original Road Runner engine. 

Cuda Ken   

[bobfist]

Thanks for answer

but does anyone know if the 71 383 rr used the 346 heads or the 906
I have diff info on that.

also are the porting the only diff on these heads?

[heyoldguy]

For 1971 there was a change during the model year. Early 1971 big blocks came with 906 heads and later in the year they switched to 346.

[bobfist]

ok, but was it only the porting that was the diff?

I have B11 build date at the fendertag, so i guess this car would have 346 heads, date 11/11/71

[John_Kunkel]

11/11/71 would be a '72 model year car. 11/11/70 would be a '71 model year car.

[bobfist]

but that is what my fender tag says B11, and its a 71 model i have

[heyoldguy]

ok, but was it only the porting that was the diff?

I have B11 build date at the fendertag, so i guess this car would have 346 heads, date 11/11/71

The difference was the shape of the ports. The heads will interchange on the 440 and all parts will interchange between the two heads.

[71 SE3834V]

but that is what my fender tag says B11, and its a 71 model i have

Don't if this info is the same but might help. I have a '71 Charger. Fender tag has B11 which translates to a build of Nov. 11 from what I found out. Door sticker shows build date of 11/70.

[A383Wing]

yes...B11 is build date of Nov. 11, 1970....early car

[bobfist]

Ah so b11 is 70? Nice!
Bec if i run my VIN: RM23 N1G 143864 in decoder it says 71
vin decoder says 143864 = 43863th Vehicle, is that early ?
Then it could have the 906 heads then, if some was leftovers.

[RECHRGD]

Pull a valve cover and check the numbers stamped on the head....

[b5blue]

346/906 will not matter for your build they look identical. While in stock condition I read that 346 will slightly outflow 906's on exhaust the real difference was that 346 were induction hardened exhaust seats for unleaded fuel. Induction hardening is just a surface hardening, a couple of valve seating's and it's removed anyway.   A 69 838 would be 906 heads if original. 

[71 SE3834V]

Pull a valve cover and check the numbers stamped on the head....

Where should one look for the #'s? And are you looking for stamped #'s not cast #'s?
Reason I ask is I had my DS cover off last year and only found a 7 digit # casted in the head and a 4 digit # that seemed to be stamped on a plate and attached to the head. Might help the OP.

Ah so b11 is 70? Nice!
Bec if i run my VIN: RM23 N1G 143864 in decoder it says 71
vin decoder says 143864 = 43863th Vehicle, is that early ?
Then it could have the 906 heads then, if some was leftovers.

Car model year is 1971 built in Nov. of 1970.

[Cooter]

Pull a valve cover and check the numbers stamped on the head....

Where should one look for the #'s? And are you looking for stamped #'s not cast #'s?

Ah so b11 is 70? Nice!
Bec if i run my VIN: RM23 N1G 143864 in decoder it says 71
vin decoder says 143864 = 43863th Vehicle, is that early ?
Then it could have the 906 heads then, if some was leftovers.

Car model year is 1971 built in Nov. of 1970.

Look along the intake runner. There should be a series of numbers like, "3462906", or "55453346"
won't be exactly like these, but you get the point.

[71 SE3834V]

Pull a valve cover and check the numbers stamped on the head....

Where should one look for the #'s? And are you looking for stamped #'s not cast #'s?

Ah so b11 is 70? Nice!
Bec if i run my VIN: RM23 N1G 143864 in decoder it says 71
vin decoder says 143864 = 43863th Vehicle, is that early ?
Then it could have the 906 heads then, if some was leftovers.

Car model year is 1971 built in Nov. of 1970.

Look along the intake runner. There should be a series of numbers like, "3462906", or "55453346"
won't be exactly like these, but you get the point.

I modified my above post but will add more info since you were so fast to reply Cooter.
The casted # I found was 3482348. Sound right?

[RECHRGD]

The last number is most likely a 6 not an 8......

[Cooter]

Yeah, looks to be "346" heads.

[71 SE3834V]

This is the only pic I took. I'm planning on pulling the pass side this year to check the movement of the rockers/cam condition. I'll look for the number on that side and clean it a bit.
So by Nov. 1970 it looks like they were building w/the 346 heads.