there is a machined flat surface near drivers side of a 440 six pack that is in my 70 challenger. the spot is near the top of the motor and is visible by just looking under the hood. the little flat spot has these numbers on it C440
414 HP

what do these numbers mean? they are just stamped on the flat spot. i cannot figure it out and i have bought several books that talk about every number but this one. thanks

There are also numbers that are cast on the block near the lower rear of the motor. these numbers are on each side of the motor. the numbers are 2536430-8. what does this mean? thanks.

 

414HP means the motor was built on April 14th and the HP means High Performance. There should also be a casting date on the side of the motor right above the 2536430-8. This is the date the motor was casted and there is a D and an N with a arrow pointint towards one of them which is the Day or Night shift with a clock looking dial by it which means the time it was casted. Let me know and I can take a picture of my 440HP six pack to show you where it's at. 2536430-8 just means it's a 440- 1966-1972. this sit has alot of info about your motor. http://www.mymopar.com/tools.htm

 

C440: 1967 Engine

2536430: 440CID 1966-1972 ( I think that is what Shatar4 meant)

Chris



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[IMG]local://upfiles/11901/12BDAE1D51334E28AFE8A33C02533EBF.jpg[/IMG]

 

As far as the year code on the block (C440), they are not always correct. Mine is a 1969 440hp six pack block but on the pad on top it says G440HP 1216. If I went by that it would be a Dec. 16, 1971 block. On the side of the block, It has 12 16 69. I would go with what the casting on the block says as opposed to the man made punches on top. Just my 2 cents!

 

You have some good points. I take it from your info you have a numbers# matching engine due to the 'G' and 1216. The Dec 16,1970 is the engine assy date, not the casting date. I have seen blocks sit around for awhile before they are assembled and then when assembled they are stamped with the correct model year and assy date of the engine, even if the block casting is a lot older. [sm=smiley20.gif]

** I had to edit my 1216 assy date to 1970. A 'G' code 1971 model year engine couldn't have an assyembly date of Dec 1971. That would be a 1972 Model year assy time frame. As a side note most of the engine block casting dates were usually within 6 months of the car build date but not always. But from what I've seen lately, there are always strange stories of weird stampings/build date info etc. [sm=smiley20.gif]

 

I saw on one of your other posts your Challenger was an original 340 car so my guess that you had a numbers matching 440-6 was off a bit. (very sharp car by the way).. Now my question is how were you able to determine you have a 1969 440-6pak block when it was stamped for a 1971 Model car year and was assembled Dec 16,1970? There is nothing on a 440 block casting that would make it a 4 barrel or 6 barrel block. Their all the same. Its the internals that make it a 6 barrel engine and the only true way to know if you have a 6 barrel engine assy is to have matched the VIN on the pan rail to the actual car it came out of, either a 'M' code 1969 440 6barrel R/R or Super Bee or the 'V' code 1970/71 model cars. My thoughts for the day.[sm=smiley20.gif]


Chris

 

Let me correct myself. The date by the dist. is 1216HP. It also has G440, which by your chart is a 12-16-71 assembly date. On the side of the block which is the "casting date", it is 7*28*69. I really don't think they let this block sit for 2 1/2 yrs before they assembled the motor. As far as me knowing it's a 6 pack motor, I know the car it came out of. You can also tell by the hamonic balancer. It looks like a "Use w/440 cast crank only" balancer but would NOT have the cast crank only phrase on it because 6 pack motors are balanced external as opposed to hp motors which are balanced internal.

 

I tend to agree with you on that fact. No question something is 'strange' about the casting date of the block compared to the top pad. Since the pad says 'G' that would indicate 1971 and the 1216Hp would have to be 1970 since the production year ran from July 1970-July 1971. The 1972 Model cars started being produced in the summer of 1971 just like todays models start in the summer previous to the model year that are stamped.. So that would have to make the 1216 Dec 16, 1970. I have no answer for the weird difference in pad/casting #'s.

You might want to read this info on Dampers/rods/balancing. Here's some info from the link:

Rods:Non-hp engines
Shown above is a standard 1851535 "RB" USED connecting rod, Chrysler part #'s 1851533, 2406770, 3462426, and 4027096. Commonly referred to as "LY" rods, these were used on the majority of "RB" engines. Weight is about 860 grams.

Rods: Six-Pack & HP engines:
Shown above is a 2951908 connecting rod, commonly known as "six pack" rods. These rods have a thicker, heavier beam cross section. These were used on HP and truck 440's (along with forged cranks only) from 1970 to 1975 under Chrysler part # 2951906. Weight is approx 920 grams.
Damper: standard rods:
This first damper is an early forged crank internal balance type, measuring 7 1/4" diameter by about 7/8" wide, with the offset (pre 72) pulley bolt pattern . Most of these types of dampers will be Chrysler # 2275897 or 2658457. These were available with either the solid ring (above left picture) or the cut ring (above right picture), and the holes in the hub may be either round or square. The difference appears to be based on the supplier Chrysler happened to use, as we have seen both types used for the same year, part #, etc. The cut ring type seems to be more commonly used. These were used from about 1962 until 71 with all forged crank engines. In 72, the bolt pattern was changed to be symmetrical and therefore a different part and associated part # were used (see below.) These usually do not have part numbers cast into them (although sometimes 2658457's will be marked on the rear inside of the hub.) Check for the offset bolt in the pulley bolt pattern to be sure.

Damper: Six Pack Rods:
Shown above is damper #3512017, commonly known as a "six-pack" damper. This damper can be easily identified by a small elliptical weight attached to the center hub. This version was used in '70 and '71 and has the offset pulley bolt pattern. Be careful not to confuse it with 3614372, which was used only in '72 and looks identical except for having a symmetrical pulley bolt pattern. Even though this damper does have an elliptical weight, it was never used with any cast cranks. These dampers were used with steel cranks and "six pack" (2951908 casting #) rods. The extra weight is to offset the added weight of the extra steel in the rods. Another important fact is that even though six pack rods continued to be used up until 1975 in HP and truck 440's with steel cranks, they did NOT use this damper. As you can see from the chart above, any 73-75 steel crank 440 (with either six pack or standard rods) would have come with the 3614371 damper. I have found this to be absolutely true.

Link for above info: 440Source

Most HP engines whether a six-pack or HP engine came with the Heavy rods and forged crank thus they used the externally balanced damper. The six-pack engines came with different pistons compared the Hp engines. So you can have a HP engine externally balanced and still not tell if it came out of a six-pack car. There has been and continues to be many posts on other forums about this very subject. There are always a few stories about different combo's but basically this is the most common info on the '69-71 HP and six pack engines.

Chris