Previous Thread
Next Thread
Print Thread
date codes #2536765
08/15/18 02:39 PM
08/15/18 02:39 PM
Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
E
ek3 Offline OP
top fuel
ek3  Offline OP
top fuel
E

Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
I have been told that the latest casting dates on 440 - 6 blocks were around 5-70 . were all the six pack engines built in two runs ? [70-71] [ excld-a12's ] if you wanted to put correct date coded exh. manifolds on a car built later than may , would they have a date when the engine was built or would they be closer to the build date ? I know things were all over the place ... does anyone have any photos of a 71 with the block and exh. manifold dates ??

Re: date codes [Re: ek3] #2536769
08/15/18 02:47 PM
08/15/18 02:47 PM
Joined: Mar 2008
Posts: 9,550
Sacramento CA
M
Morty426 Offline
master
Morty426  Offline
master
M

Joined: Mar 2008
Posts: 9,550
Sacramento CA
There are no 440 sixpack blocks, just 440 blocks.

A sixpack engine is typically marked HP2

Casting dates can be all over the place.

Re: date codes [Re: Morty426] #2536796
08/15/18 04:03 PM
08/15/18 04:03 PM
Joined: Dec 2003
Posts: 3,518
Lansing, MI
70gtx440dana Offline
master
70gtx440dana  Offline
master

Joined: Dec 2003
Posts: 3,518
Lansing, MI
Originally Posted By Morty426
There are no 440 sixpack blocks, just 440 blocks.

A sixpack engine is typically marked HP2

Casting dates can be all over the place.



HP2 designation as "typical" for 6 pack engines is a myth as far as I am aware........HP designates an HP engine assembled on first shift....HP2 indicates second shift assembly. I can think of no valid reason to only assemble 6 pack engines on 2nd shift. I assume these engines were assembled throughout the work day regardless of 4 barrel or 6 pack configuration. However, I may be proven wrong. It would not be the first time.

For the OP.....accepted date range for exhaust manifolds is several months to just a few days prior to the vehicle SPD. I don't think you will correlate it very well to block casting dates as they do not seem to align with SPD's.

Last edited by 70gtx440dana; 08/15/18 04:06 PM.

70 Road Runner 383-4 4 speed FJ5 & black guts
70 Charger R/T 440-4 4 speed FJ5 & white guts
Re: date codes [Re: 70gtx440dana] #2536807
08/15/18 04:36 PM
08/15/18 04:36 PM
Joined: Jan 2003
Posts: 43,458
Round Lake Beach, Illinoisy
Rhinodart Offline
Rhinotruck
Rhinodart  Offline
Rhinotruck

Joined: Jan 2003
Posts: 43,458
Round Lake Beach, Illinoisy
I thought six pack blocks only got six pack rods until 1972 when they started using up the supply. So if that is the case, then wouldn't there be a way to differentiate between regular HP blocks and six pack blocks? work


The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!
Re: date codes [Re: 70gtx440dana] #2536835
08/15/18 05:52 PM
08/15/18 05:52 PM
Joined: Jan 2003
Posts: 5,268
NY
7
70440+6bbl Offline
master
70440+6bbl  Offline
master
7

Joined: Jan 2003
Posts: 5,268
NY
Originally Posted By 70gtx440dana
Originally Posted By Morty426
There are no 440 sixpack blocks, just 440 blocks.

A sixpack engine is typically marked HP2

Casting dates can be all over the place.



HP2 designation as "typical" for 6 pack engines is a myth as far as I am aware........HP designates an HP engine assembled on first shift....HP2 indicates second shift assembly. I can think of no valid reason to only assemble 6 pack engines on 2nd shift. I assume these engines were assembled throughout the work day regardless of 4 barrel or 6 pack configuration. However, I may be proven wrong. It would not be the first time.

For the OP.....accepted date range for exhaust manifolds is several months to just a few days prior to the vehicle SPD. I don't think you will correlate it very well to block casting dates as they do not seem to align with SPD's.



Correct, I have three ‘70 F440 HP blocks that all happen to be out of real V -code cars. One from a ‘70 RR Lynch Rd, one from a ‘70 cuda Hamtramck (my cars numbers block) and one from a ‘70 Super Bee Lynch Rd. All are HP and not HP2.

The “six pack”/HD rods were used in all ‘70-1 440-4 HP and 6bbl engines. The only differences were the valve relief pistons and 3-bolt cams being used in the multicarb versions. Both the 4 and 6 bbl rotating assemblies were externally balanced.



Re: date codes [Re: 70gtx440dana] #2537302
08/16/18 06:32 PM
08/16/18 06:32 PM
Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
E
ek3 Offline OP
top fuel
ek3  Offline OP
top fuel
E

Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
I get it that normal range on the manifolds are 2-3 months ...I know there are no 6 pack blocks. hp or hp 2 does not matter .. that being said , for the people who have real 6 pack cars [ or photos ], with orig. blocks , what is the latest known casting date seen on a 6 pack block ? if they are all over the place , there must be an early and a latest known date ? I am talking what is known here. and , what are the dates on those known manifolds . fwiw, I have never seen a six pack block with a casted date past 5-70 If that's the case , then you would be able to look at the latest known six pack cars and look at the cast dates . the reason why is I hear they built most of the engines in two runs .I have no facts . it is just a little more info on how things were done . any takers ??

Re: date codes [Re: 70440+6bbl] #2537495
08/17/18 04:29 AM
08/17/18 04:29 AM
Joined: Mar 2008
Posts: 9,550
Sacramento CA
M
Morty426 Offline
master
Morty426  Offline
master
M

Joined: Mar 2008
Posts: 9,550
Sacramento CA
Originally Posted By 70440+6bbl
Originally Posted By 70gtx440dana
Originally Posted By Morty426
There are no 440 sixpack blocks, just 440 blocks.

A sixpack engine is typically marked HP2

Casting dates can be all over the place.



HP2 designation as "typical" for 6 pack engines is a myth as far as I am aware........HP designates an HP engine assembled on first shift....HP2 indicates second shift assembly. I can think of no valid reason to only assemble 6 pack engines on 2nd shift. I assume these engines were assembled throughout the work day regardless of 4 barrel or 6 pack configuration. However, I may be proven wrong. It would not be the first time.

For the OP.....accepted date range for exhaust manifolds is several months to just a few days prior to the vehicle SPD. I don't think you will correlate it very well to block casting dates as they do not seem to align with SPD's.



Correct, I have three ‘70 F440 HP blocks that all happen to be out of real V -code cars. One from a ‘70 RR Lynch Rd, one from a ‘70 cuda Hamtramck (my cars numbers block) and one from a ‘70 Super Bee Lynch Rd. All are HP and not HP2.

The “six pack”/HD rods were used in all ‘70-1 440-4 HP and 6bbl engines. The only differences were the valve relief pistons and 3-bolt cams being used in the multicarb versions. Both the 4 and 6 bbl rotating assemblies were externally balanced.




The reason I used the 'typically" is that ALL 5 of my Sixpack engines are stamped HP2. Statically that seems off, but obviously possible.

Re: date codes [Re: ek3] #2537497
08/17/18 04:43 AM
08/17/18 04:43 AM
Joined: Mar 2008
Posts: 9,550
Sacramento CA
M
Morty426 Offline
master
Morty426  Offline
master
M

Joined: Mar 2008
Posts: 9,550
Sacramento CA
Originally Posted By ek3
I get it that normal range on the manifolds are 2-3 months ...I know there are no 6 pack blocks. hp or hp 2 does not matter .. that being said , for the people who have real 6 pack cars [ or photos ], with orig. blocks , what is the latest known casting date seen on a 6 pack block ? if they are all over the place , there must be an early and a latest known date ? I am talking what is known here. and , what are the dates on those known manifolds . fwiw, I have never seen a six pack block with a casted date past 5-70 If that's the case , then you would be able to look at the latest known six pack cars and look at the cast dates . the reason why is I hear they built most of the engines in two runs .I have no facts . it is just a little more info on how things were done . any takers ??


Well you can forget that 5/70 date. The original motor to my 71 Challenger R/T 440 SIXPACK with a SPD of 3/31/71 has a casting date of 7/21/70 - over 8 months prior to the cars build date. However 71 dates have a far larger gap then 70 dates IMO.

Last edited by Morty426; 08/17/18 04:44 AM.
Re: date codes [Re: Morty426] #2537658
08/17/18 02:37 PM
08/17/18 02:37 PM
Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
E
ek3 Offline OP
top fuel
ek3  Offline OP
top fuel
E

Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
what are the dates on the manifolds?

Re: date codes [Re: ek3] #2537756
08/17/18 06:02 PM
08/17/18 06:02 PM
Joined: Mar 2008
Posts: 9,550
Sacramento CA
M
Morty426 Offline
master
Morty426  Offline
master
M

Joined: Mar 2008
Posts: 9,550
Sacramento CA
Originally Posted By ek3
what are the dates on the manifolds?


That I don't know. The car was made into a race car and restored back to stock. The car had headers on it when I got it.







Powered by UBB.threads™ PHP Forum Software 7.7.1