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clint282cc
Dodge Dakota
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12/17/2006
22:16:07
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 Subject: 318 360 block
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Message:
i may have understood this wrong but i always thought that the 318 and 360 blocks were the same. just different bore and mains. and to reach 160 they had more stroke too. but i was told that i cannot bore my 318 to fit 360 pistons cause its .090. difference. and thats too much. any help?
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Forseti
Dodge Dakota
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12/18/2006
00:08:38
| RE: 318 360 block
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The core they use to make the 318 and the 360 are different if you try and bore out a 318 to fit the 4" pistons of the 360 you will be in the water jacket of the 318 ......
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Kowalski
GenIII
12/18/2006
09:46:24
|  RE: 318 360 block
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Message:
Clint - you understood wrong. While the blocks appear externally similar, they are different. A couple of us aleady pointed this out to you on the first page of the "HEY rammer" thread almost 2 weeks ago, why the continued confusion ?
Lead, follow, or get out of the way
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Big Ben
Dodge Dakota
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12/18/2006
15:12:50
| RE: 318 360 block
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While I understand your confusion Clint. I also thought the same about the LA-Magnum engines being based on the 318. And in someways they are.
Just like the big 488V10 was really just a 360 bored with 2 more clyinders added.
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gen1dak
Dodge Dakota
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12/18/2006
18:15:46
| RE: 318 360 block
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The 318/360 being commonly called the "same" stems from the engines being the same design/same family, but different in the ways already explained.
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clint282cc
Dodge Dakota
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12/18/2006
18:44:10
| RE: 318 360 block
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Message:
see what i thought you were all saying was that with boreing alone i couldnt not reach 360. i did not know that you cannot fit a 360 4" piston in a 318. thats all i wanted to know. how the hell did they get a 318 to a 408 with low enough compression to still have a supercharger?
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gen1dak
Dodge Dakota
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12/19/2006
08:37:59
| RE: 318 360 block
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Message:
Some blocks, especially the older ones, come through with thicker cylinder walls that will actually allow boring to .090" (for a 402 displacement) but only sonic testing can determine this.
http://www.hensleyperformance.com/index.php?op=click&type=2&page=7
On the compression side of things, that's handled with the pistons.
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daddio
Dodge Dakota
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12/19/2006
09:09:07
| RE: 318 360 block
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clint, a 408 stroker is based off of a 360. a 390 stroker is based off of the 318.
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Mopar318
GenII
12/19/2006
10:36:42
| RE: 318 360 block
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Message:
A 408 is a 360 + 4.00" crank+ .030" over bore.
This comes out to a 4.03 bore X 4" stroke = 408 CI.
A 390 is a 318 4.00" crank+ .030" over bore
This comes out to a 3.94" bore X 4" stroke = 390
The mains on a 360 are larger than a 318. The 318 can be machined to use the larger mains but that can cost lots of$$$$
Im trying to find out if I can get a 3.31 with the 360 mains. That would be equal to a 338 with a .030" overbore. The bore/stroke ratio would be very high wich would make for some nice revs.
Old setup: 1/4 mile on old setup: 13.965 @ 100.10 MPH, Crappy 2.236 60' on street tires
Mods: Paxton NOVI 2000 supercharger @ 10 #'s, M1 4Bbl, F&B 58mm TB, Gibson headers, JBA Y-pipe, and a Locker
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daddio
Dodge Dakota
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12/19/2006
10:50:38
| RE: 318 360 block
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Message:
i think you'll lose some torque but your blower should help compensate for that. if you're running an auto you may have to up your stall rpm.
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Kowalski
GenIII
12/19/2006
13:11:53
| RE: 318 360 block
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Message:
To put a 360 crank in a 318 (or 440 in 383/400) I've heard its cheaper to turn down the mains on the crank than machining the block. Edges should be radiused for strength. Still pricy though.
Lead, follow, or get out of the way
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gen1dak
Dodge Dakota
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12/19/2006
18:04:41
| RE: 318 360 block
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You can buy a new 4" stroker crank with 318-sized mains for around $350.
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rammer
Dodge Dakota
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12/22/2006
21:37:38
| RE: 318 360 block
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Message:
any one in arizona or really close have a 318 or 360 for sale cheap?. i need it for my truck. when the motor blew im almost sure it broke the block cause there was water in oil!
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clint282cc
Dodge Dakota
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12/22/2006
23:12:08
| RE: 318 360 block
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Message:
u sure the head gaskets are ok?
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gen1dak
Dodge Dakota
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12/25/2006
13:18:29
| RE: 318 360 block
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Agreed, could easily be a blown head gasket.
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GraphiteDak
GenIII
12/25/2006
16:45:47
| RE: 318 360 block
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no way his block is ok. I was driving behind Rammer when it came apart. And as many times as that rod came thru the oil pan the block had to be wacked by the rod and who knows it may have wacked the head(s) too!
some day we will pull his engine...
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GraphiteDak
GenIII
12/25/2006
18:34:12
| RE: 318 360 block
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no way his block is ok. I was driving behind Rammer when it came apart. And as many times as that rod came thru the oil pan the block had to be wacked by the rod and who knows it may have wacked the head(s) too!
some day we will pull his engine...
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gen1dak
Dodge Dakota
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12/25/2006
21:42:13
| RE: 318 360 block
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Message:
Well, I guess it depends on what he means by having a blown engine, which isn't mentioned here.
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