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318 Block with 360 Heads

  
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318 Block with 360 Heads

 
SRT73 SRT73
User | Posts: 73 | Joined: 09/10
Posted: 10/25/10
07:13 AM

Has anyone ever done that? I'm thinking of building a motor and I have heard that if you put 360 heads put on a 318 block basicaly makes a 340. Advice or suggestsions would be helpful. Just tryin to get some different ideas for a small block motor that can make good power. Thanks  

Budnicks Budnicks
Guru | Posts: 1497 | Joined: 08/10
Posted: 10/25/10
01:30 PM

SRT73 Changing cylinder heads dosen't change displacement like that, formula is Crank shaft stroke x cylinder bore x cylinder bore x # of cylinders x .7854 = Cubic inchs (examble std. bore 440 mag.) is  3.75" x 4.32"x 4.32" x 8 x .7854 = 439.72346 ci., You didn't mention whether it was a LA or Magnum style motor or in short yes you can put 360ci/5.9lt. heads on a 318ci/5.2lt. but you will loose compression the 360 head has larger combustion chambers & yes they do usualy flow & perform better with the right parts (pistons, gasgets, intake, valve train, rockers, pushrods, valve covers etc.) you can also use 5.2lt./5.9lt. (318/360)Magnum heads on a LA short block with the proper parts & vissa versa 318/340/360ci LA heads on a Magnum 5.2lt./5.9lt. short block with the proper parts listed above. this is just general information we would need much more specific info. to tell you more,  I am realy a big block guy but own both, Budnicks  
"Fill Your Library Before You Fill Your Garage" Good Luck  "Budnicks"

marcohotrod340 marcohotrod340
Enthusiast | Posts: 461 | Joined: 09/08
Posted: 10/25/10
02:20 PM

many 318s have been done with 340 and 360 heads for the bigger valves and ports=more mid to upper rpm power the goal. but pre 1992 340 + 360 heads also have a larger chamber as is = less power. so use the 1993+ magnum heads, they have smaller chambers. a small block with good power starts with a 340 on up these days. don't try to reinvent the wheel, read up on what works and figure the whole combo, what are you trying to do and what is the vehicle weight, trans, gears, tire size, etc. etc.  

SRT73 SRT73
User | Posts: 73 | Joined: 09/10
Posted: 10/26/10
10:38 AM

@Budnicks- Thanks for the imput. I knew that it couldnt change the displacement just like that but I had heard a rumor of someone taking a 318 & a 360 (both LA motors) and creating a 340 out of them. Sorry I wasnt very specific in my post i didnt have time to write it here at school.lol But I dont think im going to do that. I just wanted to know if anybody had ever done it and what it was like. I'm just going to build an LA 360 to put in my 74 Satellite. I'm lookin to make 400minimum hp out of it. I'm still in highschool and i only work parttime so i dont have all the money to do it right away but its a work in progrress. I drive the car right now as a Daily with its original 318.I'm basically just looking around and finding ideas of what i really want to do and how i can get the power im looking for. But Thanks again for you're imput  

marcohotrod340 marcohotrod340
Enthusiast | Posts: 461 | Joined: 09/08
Posted: 10/26/10
02:57 PM

yes we did it atleast 15 years ago, a 318 block and a 360 crank with the mains ground down to 318/340 size and a bore size of 3.94" = 349 cubes. and the best part is the right pistons are OK balance wise. the same as a 5.7 hemi is 344 cu in  

Budnicks Budnicks
Guru | Posts: 1497 | Joined: 08/10
Posted: 10/26/10
05:02 PM

Marcohotror340 thats still not a 340 thats a 318 w/360 crank that is a mini stroker the way I read his post is he wnted to use 360 heads to make a 318 into a 340, Budnicks  
"Fill Your Library Before You Fill Your Garage" Good Luck  "Budnicks"

marcohotrod340 marcohotrod340
Enthusiast | Posts: 461 | Joined: 09/08
Posted: 10/27/10
03:36 PM

" I heard a rumor of someone taking a 318 + a 360  both la  and creating a 340 " with 360 heads is "creating a 72-73 340 something" as long as u use a windage tray and a double roller and full floating pins and  

Budnicks Budnicks
Guru | Posts: 1497 | Joined: 08/10
Posted: 10/27/10
10:10 PM

marcohotrod340 that makes no sense to me, you can't put 360 heads on a 318 & make a 340 dosen't work like that bore & stroke are still different, it's just a 318 with 360 heads not a 340. unless I am missing something here, Budnicks  
"Fill Your Library Before You Fill Your Garage" Good Luck  "Budnicks"

marcohotrod340 marcohotrod340
Enthusiast | Posts: 461 | Joined: 09/08
Posted: 10/28/10
03:49 PM

340's are scarce. first srt73 asked about "if you put 360 heads on a 318 block it basically makes a 340" - no.  then  " a rumor of someone taking a 318 & a 360 (both la) and creating a 340"   hey bud, I never said you will make an ORIGINAL 340, what I did was discuss the subject of useing a 360 crank in a 318 block (3.58" stroke and 3.91" bore = 344 cubes)   a 340 is 4.04 x 3.31  throw on the 360 heads, a 340/360hp cam and valvesprings etc, and a double roller and a windage tray and you are very close to a 1972-1973 340. you are missing being more open minded  

Budnicks Budnicks
Guru | Posts: 1497 | Joined: 08/10
Posted: 10/29/10
03:53 PM

Yes marcohotrod340 your right & yes I am narrow minded & I think you should educate people correctly, & yes that dose make a 343.8ci is (3.91" std. bore X 3.58" stroke =344 roughly)if you tell someone who dosen't now what a "real 340" is (4.04" std. bore X 3.31" stroke = 340ci roughly) how are they going to know, a  real 360 is (4.0" std. bore X 3.58" stroke = 360ci roughly) & a 318 is (3.91" std. bore X 3.31" stroke = 318ci roughly) these are the actual dimensions of the ORIGANL engines, I know we are just talking semantics but if you tell someone something that is not correct, I believe they call that wrong, SRT73 is a high school student I believe I read from a pryor post he will be well informed of the dimensions now, you & I disagreeing dose not change the facts, sorry if you where affended, narrow minded old guy, Budnicks  
"Fill Your Library Before You Fill Your Garage" Good Luck  "Budnicks"

marcohotrod340 marcohotrod340
Enthusiast | Posts: 461 | Joined: 09/08
Posted: 10/29/10
05:41 PM

24 hours before you, I said an original 340 is 4.04 x 3.31.  what did I post that is not correct? read everything carefully again before you vent.  

Budnicks Budnicks
Guru | Posts: 1497 | Joined: 08/10
Posted: 10/29/10
08:50 PM

I'm sorry you are right I am wrong, you win I loose, your the best I'm the worst, I wasn't venting yet, It's a 318 with 360 heads, oh I'm sorry your right I'm wrong, you win I loose, your the best I'm the worst, ease up LOL HA HA HA, Budnicks  
"Fill Your Library Before You Fill Your Garage" Good Luck  "Budnicks"

marcohotrod340 marcohotrod340
Enthusiast | Posts: 461 | Joined: 09/08
Posted: 11/02/10
03:04 PM

bud, if u read the 2nd srt73 post he or she changes from your head fascination to saying " I heard a rumor of taking a 318 and a 360 and making a 340 cubic inch engine, never did we say it would be an original 340 engine. give srt73 more credit than that, we all know a 360 crank in a 318 block is not an original 1968-1973 340, but cubic inches is cubic inches, and anyone out there that  does not have a 340 may grind the mains on a 360 crank down and pop it in a 318 block and depending on the final bore size have a 344-354 engine  

Budnicks Budnicks
Guru | Posts: 1497 | Joined: 08/10
Posted: 11/02/10
04:49 PM

marcohotrod340 like I said "I'm sorry your right, I'm wrong", you are stuburn one are'nt you, your all knowing I bow to your expertease, Budnicks  
"Fill Your Library Before You Fill Your Garage" Good Luck  "Budnicks"

marcohotrod340 marcohotrod340
Enthusiast | Posts: 461 | Joined: 09/08
Posted: 11/03/10
03:06 PM

adding to the library with my focus on reading exactly the 1st post, the 2nd post, etc. with my expertise. no need to be sorry