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gary r.
Dodge Dakota
JOIN HERE
12/31/2002
16:48:15
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 Subject: 360 heads on 318
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Can this be done? What benefits or problems am I looking at?Can anyone tell me what size the valves are in the 318 and the 360?The 318 is an '88 model and the 360 heads are off an '80 model.sorry if this posted more than once my computer had a hickup.
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rtdkota
R/T
12/31/2002
18:51:18
|  RE: 360 heads on 318
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Sam heads, 318 or 360-- both LA motors.. The '80 heads might be part of the lean burn era... and not the greatest. Heads 'should' be 1.92 & 1.60
If not, really close---
Sam
RTDKOTA
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CW
GenIII
12/31/2002
22:03:08
|  RE: 360 heads on 318
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Message:
Actualy they aren't the same. I have a 318 with 360 heads and 340 intake with edlbrock carb. Need to shave the 360 head about .050" to get the compression back though. The differences can be seen with the naked eye. The intake and exhaust ports are bigger in the 360 head.
Intake size on the 360 is 1.88" exhaust is 1.60"
Intake size on the 318 is 1.72" exhaust is 1.48"
I am not a 100% sure on the size of the 318 valves but I know I am close.
I am about to try a set of 2.02 heads and mechanical cam on that 318 next. Mated to a 3000 stall and 3.92 gears it should scoot. Except all I have right now is a full size 1/2 ton.
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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kota on 20s
GenIII
1/01/2003
06:13:29
| RE: 360 heads on 318
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Message:
the magnum heads are the same though, right?
~Eric
Superdupercharged, M-1, 1.7 RR's, 52mm TB, PPH Ceramic Headers & Y-pipe, 3" carsound cat, 3" dumped gibson
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CW
GenIII
1/01/2003
13:05:32
| RE: 360 heads on 318
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Message:
Yeah the magnums are the same. Not a bit of difference between the the 3.9 5.2 and 5.9 except the 3.9 is a little shorter.;)
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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IntenseDak39
*GenIII*
1/01/2003
13:52:10
| RE: 360 heads on 318
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Message:
yeah the magnums are the same but the LA heads are different. The 360's heads were designed for a four barrel intake manifold and carb whereas the 318 from that era only sported a 2 barrel manifold and carb. the only way to get around it was to switch heads.... but they should bolt up to the block the same
"except the 3.9 is a little shorter"
hey! its not how long the wave is but the motion of the ocean ;-)
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FazDak
GenII
1/01/2003
17:41:06
| RE: 360 heads on 318
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Not to be difficult here Greg but there were plenty of LA series 360's with 2bbls. I have one of em left. The only differnce between 360 2bbl engines and 318 2 bbl engines is the 360 did have a bigger 2 bbl and a better flowing 2 bbl intake.
Oh, and there were 318 4bbl engines, they were called "Comando's" and were primarily found in police cars and one more correction........a 4 bbl intake from any LA series engine (stock not W2 and up) will fit any other (bolt pattern wise) but the intake ports will have size and shape differences.
hope this helped on the old scholl stuff.
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gary r.
Dodge Dakota
JOIN HERE
1/02/2003
02:14:16
| RE: 360 heads on 318
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Message:
So, I can put 360 heads on my 318, but I will lose compression?To regain that compression I need to have the heads shaved about .050".I fi do this am I looking at more power than my 318 heads are giving me?
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kota on 20s
GenIII
1/02/2003
02:19:27
| RE: 360 heads on 318
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Message:
by shaving down the head, you might have problems with the rocker arm geometry. also, you will probably need to shave down the intake manifold, because it might not line up properly.
you might just be opening a can of worms you dont want to deal with
why not just port and polish the stock heads?
~Eric
Superdupercharged, M-1, 1.7 RR's, 52mm TB, PPH Ceramic Headers & Y-pipe, 3" carsound cat, 3" dumped gibson
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IntenseDak39
*GenIII*
1/02/2003
05:08:40
| RE: 360 heads on 318
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Message:
thanx scott, i was just going by what i have seen.... never seen a 4 bb 318 before.
gary,
kota is right, you might have to get custom length pushrods, shave some off your intake... and so on. My uncle is building a badass 350 that my brother sold him and it is becoming a mess. We found out that the top of the block was shaved a little and when it was time to put the expensive intake manifold on... guess what.... 1/4" gap between the block and the manifold, ouch!
i think that you should stick with your 318 heads and have them worked on a bit or buy new performance 318 heads. I cant remember the name of the company, but they sell 318 heads for like $400 (pair) with 2.02 valves and all the goodies... if you want me to i will look into it
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CW
GenIII
1/02/2003
09:37:48
| RE: 360 heads on 318
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Message:
You guys complicate things to much you just shim the rocker shafts .050". If you just slap on the 360 heads you will end up with below 8:1 compression. Probably well below. Not good for economy or power. As far as the intake take .0095" off for every .010" off the head. I have done all this before.
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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IntenseDak39
*GenIII*
1/02/2003
12:42:18
| RE: 360 heads on 318
IP: Logged
Message:
good call CW... and to fix that 8:1 compression just stick a turbo on it ;-)
Turbocharged V6
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CW
GenIII
1/02/2003
14:37:51
| RE: 360 heads on 318
IP: Logged
Message:
Yeah with that kinda compression a guy could really turn on the boost. Ya run your turbo yet?
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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IntenseDak39
*GenIII*
1/02/2003
15:27:06
| RE: 360 heads on 318
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Message:
i havent run it at the track yet... i dont think its open anymore for the season. I have really gotten on it and it feels just as powerful as the 100 shot of nitrous BUT i have a big stall when i am around 3800-4200 rpms because of lack of fuel... once i get an aux. pump and fmu i will be set... also coming soon will be an intercooler. woo hoo!! maybe it will be ready when the track reopens.
Turbocharged V6
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gary r.
Dodge Dakota
JOIN HERE
1/02/2003
16:55:21
| RE: 360 heads on 318
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Message:
I need to do something.If I have my heads ported and polished, would I be looking at more power I'm really not clear on the benefits of this "novice".I'm not looking to buil a hotrod I just want a little more power out of it.What kind of expense am I looking at?If I do this does it require any other mod.s be done?
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CW
GenIII
1/02/2003
20:15:58
| RE: 360 heads on 318
IP: Logged
Message:
If you don't want a hotrod then just swap the heads don't worry about porting them.
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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FazDak
GenII
1/02/2003
20:57:18
| RE: 360 heads on 318
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Message:
Your only talkin a couple of CC difference.
I have put 360 unported heads on a 318 with a repro 340 cam, Edelbrock dual plane intake and Holley 650 vac secondary and all that woke it up big time. Still not up to a stock 340 or 360 that came with 4bbl originally but compared to what it was before it was worth it.
That was on a 86 Dodge 4x4.
I have had two sets of "shaved" heads, both worked fine shimmed (as CW stated) but leaked like a mother at most all the gaskets. I did have milling done to suposedly take care of the head surface shave but it didnt help either time. Dont do it, buy pistons if you must regain your compression. Just my .02.
Good luck
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Tom Slick
GenII
1/03/2003
00:42:51
|  RE: 360 heads on 318
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Message:
Just an FYI...
5.2L(318) magnum stock heads and 5.9L(360) magnum stock heads are identical...
Later!
Tom "Slick"
96 Dakota Sport 5.2 RC SB
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kota on 20s
GenIII
1/03/2003
01:51:58
| RE: 360 heads on 318
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Message:
we made that clear way up in the post dude....;-)
~Eric
Superdupercharged, M-1, 1.7 RR's, 52mm TB, PPH Ceramic Headers & Y-pipe, 3" carsound cat, 3" dumped gibson
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gary r.
Dodge Dakota
JOIN HERE
1/03/2003
02:01:53
| RE: 360 heads on 318
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Message:
I had it bored out .040" already so I'm hoping to pick up some compression there.I want to put a 340 cam in it but my 318 is a roller tappet.Does this matter or can I use any 340 cam?So since it's bored .040" if I go ahead with 360 heads do you think it will help more than hurt?And again does the cam have to specifically for a roller tappet and is there such an animal as a 340 roller tappet cam?
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steve
Dodge Dakota
JOIN HERE
2/07/2003
11:54:37
| RE: 360 heads on 318
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Message:
stay with the 318 heads there a swirl port,use the 360 valves there 1.88 int,1.60 ext..theres a article on this at mancini racing sckoll to update 2001.
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FazDak
GenII
2/07/2003
16:04:39
| RE: 360 heads on 318
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Message:
Yes you can use the 340 cam but you will have to go with hyd lifters, the rollers will not work.
steve is partially correct, the 318's you have do ahve a slightly more efficient "swirl port" design but I have seen more improvement with the bigger valves of the 360's myself. Now if you were to have the 318's ported to 1.88/1.60's or even better, 2.02/1.60's than you would have a better head.
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