Go Back   Mopar Forums > GENERAL > General Technical Questions
Sign in using an external account
Register Forgot Password?
Search

Reply
 
 
 
submit to reddit
 
LinkBack Thread Tools Search this Thread Display Modes
Old 01-24-2013, 07:06 PM   #1
New Member
 
Join Date: Mar 2011
Location: Runnelstown,mississippi
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
318 heads on 360

I just recently acquired a 360 block, it's a 78 model. I am rebuilding it, bored 30 over, rv cam, headers, nothing real special. I have a set of 318 heads that were just reworked for another project and they didn't get used. The motor is going in a 4x4 and probably won't be seeing more than 4500 rpms. My question is, will these heads do what I want them to on the bottom end and mid range? Thanks guys!
lunati318 is offline   Reply With Quote
Old 01-24-2013, 07:27 PM   #2
Mopar Lover
 
Gorts 5th's Avatar
 
Join Date: May 2012
Location: Debary Florida
Posts: 1,190
Thanks: 127
Thanked 94 Times in 94 Posts
Smile

Welcome
Larger valves would help and if your ambitious porting would be that much better.
Gorts 5th is offline   Reply With Quote
Old 01-24-2013, 09:04 PM   #3
Mopar Lover
 
Join Date: Nov 2007
Posts: 2,417
Thanks: 1
Thanked 246 Times in 240 Posts
Actually if that is all you are going to turn it up, the small port heads might even be a slight advantage.

Believe it or not, many years ago 78? 80? I wanted to "get rid" of a 360, and a friend & I had junked a Commando 273, IE 4bbl intake. I put those heads and intake on the 360. That thing was a torque monster in high gear on the highway, but about 3800 you might just as well have shut off the key as try to wind it higher. This was with the factory 360 cam.

Last edited by 440roadrunner; 01-24-2013 at 09:07 PM.
440roadrunner is offline   Reply With Quote
Old 01-25-2013, 05:27 AM   #4
Mopar Lover
 
Gorts 5th's Avatar
 
Join Date: May 2012
Location: Debary Florida
Posts: 1,190
Thanks: 127
Thanked 94 Times in 94 Posts
Smile

What kind of cam are you thinking on running...?

The head's will limit you on intake, carb, and cam, size and selection.
if you intend to use these head's bigger valves will be the most important up grade.
i you try stuffing too much through those head's your combo will fall on it's face,
Gorts 5th is offline   Reply With Quote
Old 01-25-2013, 06:15 AM   #5
Mopar Lover
 
Gorts 5th's Avatar
 
Join Date: May 2012
Location: Debary Florida
Posts: 1,190
Thanks: 127
Thanked 94 Times in 94 Posts
Smile

Quote:
Originally Posted by 440roadrunner View Post
Actually if that is all you are going to turn it up, the small port heads might even be a slight advantage.

Believe it or not, many years ago 78? 80? I wanted to "get rid" of a 360, and a friend & I had junked a Commando 273, IE 4bbl intake. I put those heads and intake on the 360. That thing was a torque monster in high gear on the highway, but about 3800 you might just as well have shut off the key as try to wind it higher. This was with the factory 360 cam.
This is what i experienced i installed a 268 h in a 77 318 stock no compression changing. Edel performer intake 600 vac holle.
the car was way faster than the original set up.
up too about 4000 then after that i could feel the cam was star-vin for air/fuel !...

My motor head budi back in my high school day-s, use to throw a set of 360 head's on 318's and made them screamer's, man he was crazy 7000 plus rpm's all the time he tried to blow them up! On a simple head cam swap's+4bbl+any size carb! He's why i quit chevy and went too mopar...

Well as soon as i swapped out the heads i lost a slight bit on lower end but the gains to low mid too upper rpm range was huge the motor had so much available to it it worked effortlessly to inhale.. lol.
Then each new combo i increased the V.E. with out swapping the 1.88 s intake / 1.60 exhaust
my new combo is the best yet the little 318 eats up the rpm's so fast! She torque-e and has plenty of upper rpm power and is very street-able, she doesn't even sound like a 318 more like a 340 .
i have been trying to make a video running down the road but the mic.s cant handle all the db's.
With a 650 double pumper i would gain even more down the " unofficial 1/4 " ...
Gorts 5th is offline   Reply With Quote
Old 01-25-2013, 11:32 AM   #6
Mopar Lover
 
Skwerly's Avatar
 
Join Date: Jan 2010
Posts: 581
Thanks: 0
Thanked 44 Times in 43 Posts
When you put the 360 heads on the 318s, were you shaving them at all to get the compression back down a little, or was it a direct bolt on swap?

I’ve heard doing the 360 head swap will make the engine sluggish on the bottom end.
__________________
1968 Plymouth Sport Fury. B5 Blue. 318. Car has been through hell and back, and is now under the knife.
Skwerly is offline   Reply With Quote
Old 01-25-2013, 03:21 PM   #7
Mopar Lover
 
Coronet 500's Avatar
 
Join Date: May 2011
Location: Ontario Canada
Posts: 1,300
Thanks: 0
Thanked 156 Times in 149 Posts
With the small cam, small valves and high velocity from the small ports it will work well at the lower RPM's your planning.

My only question would be what year are the 318 heads ie combustion chamber size.
Coronet 500 is offline   Reply With Quote
Old 01-26-2013, 06:48 AM   #8
Mopar Lover
 
Gorts 5th's Avatar
 
Join Date: May 2012
Location: Debary Florida
Posts: 1,190
Thanks: 127
Thanked 94 Times in 94 Posts
Smile

My first swap was straight no milling my buddy from high school use to do straight swaps also, not sluggish.. here's the trick though, you cant just put the largest duration cam in there you want but a dual duration cam will perform better, or install largest vales, 1.88/1.60 are perfect and some type of spread bore carb will help. Small primaries large secondaries.
The combo i have now has been milled real close to 0.50 the port job on the heads is what i think makes the difference the motor inhales effortlessly and she is torky at low rpm's.

i have been trying to get a recording vid/sound to post but the mic cant handle all the db's. and i get distortion
Gorts 5th is offline   Reply With Quote
Old 01-26-2013, 06:48 AM
MoparForums
1970 Dodge Challenger




Paid Advertisement
 
 
 
submit to reddit
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
heads mrindiglo2004 New Members 5 05-04-2011 02:38 AM
Heads mrindiglo2004 General Technical Questions 0 04-22-2011 08:58 AM
906 heads on a 400? Brian Parmeter General Discussion 11 02-25-2010 11:18 AM
318 with 360 heads devilkin4 General Discussion 19 05-23-2009 12:31 AM
w2 heads ryan_e General Technical Questions 2 03-11-2009 03:04 PM


All times are GMT -7. The time now is 09:17 PM.


Advertising - Privacy Statement - Terms of Service - Jobs

Content Relevant URLs by vBSEO 3.5.2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88