340 6 pack more valuable?

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Wilnutt

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is a 340-6 block worth more than a 340-4 or 340-2 block?

I'm assumin being that it means it's an original 6 pack block, i owuld say yes???
 
Uhhhhh Yeah.... When you find the 340 - 2 let me know..... :thumbup:
 
The difference between 340 T/A and standard 340 block is T/A panrail is filled in and the bulkheads are thicker. None use 4-bolt main caps in standard form, except for the specially machined 340 race block, but the T/A block has provisions to machine for 4-bolt mains.
 
maybe memory serves me wrong but werent the 340 six pack blocks in the aar cuda's factory 4 bolt???
 
I have a 69 340 dart with 340-6 on the block. It doesnt mean that it is a six pack or six barrell block.
 
i thought that teh last 4 digits like 340-6 meant it was originally a 6 barrel set up from factory..if not, what does it mean
 
Mike, is right that the block is thick enough for 4 bolt mains but did not have then from the factory in the production cars. They had to be added by the customer.


Chuck
 
Wilnutt said:
i thought that teh last 4 digits like 340-6 meant it was originally a 6 barrel set up from factory..if not, what does it mean
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I would also like to hear about the "dash" number after the engine size. Pretty much all of the Mopar engines have them, "318-8" "360-6" etc.

I will tell you what I have heard it was and I am not saying this "is" what is or I'm not discounting it either because I don't know what it is and was hoping that someone can tell us.

I heard that it is the quality of the casting as far a accuracy like core shift, etc. the lower the number means the better the block. Well, that's what I heard when I started buying Mopars.

My '73 340 in my drag car is a 340-1



Chuck
 
340mopar said:
I would also like to hear about the "dash" number after the engine size. Pretty much all of the Mopar engines have them, "318-8" "360-6" etc.

I will tell you what I have heard it was and I am not saying this "is" what is or I'm not discounting it either because I don't know what it is and was hoping that someone can tell us.

I heard that it is the quality of the casting as far a accuracy like core shift, etc. the lower the number means the better the block. Well, that's what I heard when I started buying Mopars.

My '73 340 in my drag car is a 340-1

Chuck
Click to expand...
Chuck
Sand core pieces are used in making the engine block mold. During production some of the sand cores get worn/damaged/etc and need to be replaced before the next block mold is ready to be poured. Each time a sand core piece is replaced the dash number -2-3-4 goes up (one or more core pieces could be replced, but the dash number only goes up 1). A lower dash number has no better chance of being a better casting than a higher number, although some may disagree. I had a 340 -12 bored .040 with no ill affects. that is the highest number I have seen. There is a point in mold making when the mold is no longer usable as each casting has an affect on it, but what that limit was I have no idea.
Hope this helps. :coffee2:
 
340 Mopar
How would they know what number to put in the casting for core shift until the block is poured and inspected.There is no way to tell how much core shift before it is made! If that was the case they could make them all with no core shift and all would be "340" with no more numbers in the casting! I have no idea what the last digit or number means but I bet it has nothing to do with the quality of the block,core shift etc. Simply because there is no way to know in advance when the casting number is or was installed! :scratch:
 
Below are casting numbers taken from MYMOPAR site referring to 340 blocks. Mike

2780930 340 1968-73 LA Except T/A & AAR
3577130TA 340 - 6 bbl 1970 LA T/A & AAR
 
1969340dart that is the exact thing I said when I was told this story but being I was new to Mopars at the time I was in no position to say otherwise.


Chuck
 
1966 dart wagon said:
so what would it take to make a regular 340 into a 4 bolt main?
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There are aftermarket companies making 4 bolt main caps for the blocks but being the main webs of a "standard" block are not really thick enough to do the conversion I wouldn't do it. Given the size of the main bolts (the same size as a big block) the block left in 2 bolt form is still a stout main set up.


Chuck
 
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