Re: date codes
[Re: Morty426]
#2536796
08/15/18 04:03 PM
08/15/18 04:03 PM
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Joined: Dec 2003
Posts: 3,528 Lansing, MI
70gtx440dana
master
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master
Joined: Dec 2003
Posts: 3,528
Lansing, MI
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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
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Re: date codes
[Re: 70gtx440dana]
#2536835
08/15/18 05:52 PM
08/15/18 05:52 PM
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Joined: Jan 2003
Posts: 5,268 NY
70440+6bbl
master
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master
Joined: Jan 2003
Posts: 5,268
NY
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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.
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Re: date codes
[Re: 70440+6bbl]
#2537495
08/17/18 04:29 AM
08/17/18 04:29 AM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
master
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master
Joined: Mar 2008
Posts: 9,550
Sacramento CA
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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.
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Re: date codes
[Re: ek3]
#2537497
08/17/18 04:43 AM
08/17/18 04:43 AM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
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master
Joined: Mar 2008
Posts: 9,550
Sacramento CA
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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.
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Re: date codes
[Re: ek3]
#2537756
08/17/18 06:02 PM
08/17/18 06:02 PM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
master
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master
Joined: Mar 2008
Posts: 9,550
Sacramento CA
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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.
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