|
|
|
|||||||
|
#1
11-24-2003, 10:02 PM
|
|||
|
|||
318 To A 340/360
WHAT WOULD IT TAKE TO TURN MY 318 INTO A 340 OR 360? MY UNDERSTANDING IS THEY USE THE SAME BLOCK AND THE 340 IS JUST DIFFERENT HEADS, BUT IM PROBABLY WRONG. I KNOW I WILL HAVE TO BORE THE CYLS TO GET IT TO THE 360 BUT IS THERE ANYTHING ELSE I NEED TO DO IF I ATTEMPT THIS BESIDES SWAP HEADS?
|
|
#2
11-24-2003, 10:46 PM
|
||||
|
||||
|
The 340 has a completely different bore, bigger than the 360 even. I am ALMOST certain and don't hold me to this, you can't bore out a 318 to a 340. Nor can you bore it out to a 360. I am not sure of the difference between the 340-318 crank as they have the same stroke. Wonder if they are interchangable?...
__________________
- "Jonny Small-Tires" '73 340 Roadrunner '67 Valiant (not stock) http://www.mopars.org/images/9907imgl.jpg Starving college student spending more than he can afford for his obbsession, motorsports!
|
|
#3
11-24-2003, 10:56 PM
|
||||
|
||||
|
The 318 has a bore of 3.910. The 360 has a bore of 4.00. The 340 has a bore of 4.04. You can't bore a 318 out to a 340 bore, or a 360.
The 318 and 340 cranks are the same (as is the 273) except the 340 has heavier counterweights. But you can use the 318 crank in a 340 block, just balance it (same goes for the 273). The 273/318/340 crank all have the same stroke (3.313) and the same main bearing size. I forget what it is. Being old sucks. The 360 has a longer stroke (3.590) and bigger main bearings. You can turn a 360 crank down to 318/340 mains and put it in a 318 or 340 as a cheap stroker. Takes special pistons (unless you can find a .020 over 340 block. Yhen you can use .060 over 360 pistions and it's a bolt in deal). But LOTS of guys do it. M.S.
|
|
#4
11-24-2003, 11:01 PM
|
||||
|
||||
|
318-340 can be interchanged in the crank dept. 360 has a larger stroke and larger mains. A 318 cant be bored to a 4.04 to get the 340 pistons in there. You may be able to do it on paper but that is what the walls will be at that overbore. 340/360 has a slightly different passenger mount ear location that can be fixed with a few washers between the old 318 mount and the new 340/360 block.
|
|
#5
11-25-2003, 03:47 AM
|
||||
|
||||
|
The largest bore you can get out of a 318 will be 3.97 at .060 over giving you 328 cubic inches. I know 'cause I have one for sale. Add a turned down 3.58 stroke crank out of a 360 and you should net cubes about 355. Real common stroker combo as it's used in circle track a lot. If you do that, also change the dampner as the 360 is externally balanced while the steel forged 318/340 crank is internal. You would have to take the complete rotating assy in for balancing before assembly in the block...
|
|
#6
11-25-2003, 08:43 AM
|
|||
|
|||
|
Did one of you fella mention that special pistons would be required? If so what kind? That sounds like an awesome, sleeper type build up!!!! What would the tota; cubes be with .30 overs I dont have my calculator?
__________________
05 Hemi Magnum R/T (Current) 71 Satellite Custom (Current) 85 Dode Ram /6 (Current) 73 Swinger 76 Ram 3/4 Ton 77 Ram Shortbed 1/2 Ton 74 Duster w/318 92 Sundance 89 LeBarron Convertable Turbo
|
|
#7
11-25-2003, 10:00 PM
|
||||
|
||||
|
.030 on a 318 will bring you around 323. Those pistons should be shelf items, unless you want a particular compression height, etc. For inexpensive pistons that work well on a mild build, I would recommend the Sealed Power line. For a few extra bucks, you can go with KB Silvolite hypers or all the way up the line to Arias forged....
|
 |
|
|
Linear Mode
