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360 HEADS SWITCH!
#145398
11/03/08 11:49 PM
11/03/08 11:49 PM
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Joined: Jul 2008
Posts: 580
Detroit,Michigan USA!
erick72
OP
mopar
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OP
mopar
Joined: Jul 2008
Posts: 580
Detroit,Michigan USA!
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Ok you guys are probably sick of hearing me.i know im a kid and i probably get annoying.  I was told that adding 360 heads with the 1.88 valve i can just bolt on and go on my 1972 plymouth 318.Then i have been told it is a bad idea and a great idea.So i need to know the Pro's and Con's what will it add and what will it take away? thanks guys i bow down to you 
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Re: 360 HEADS SWITCH!
[Re: erick72]
#145400
11/04/08 12:57 AM
11/04/08 12:57 AM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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You can do that and get a nice super low compression ratio and slow port velocity, great combo for a lower cubic inch engine to lose all tq at all. If you have ever driven a factory 4bbl 318 that had those heads you will see they are total dogs till they get reving and even then it don't make up for the lack of tq, the factory only did it for the emmision aspect. The only tim they will do you any good is with some way of brinngin the compression up a bunch plus running a cam that makes a 318 rev up pretty high.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 360 HEADS SWITCH!
[Re: erick72]
#145404
11/04/08 02:31 AM
11/04/08 02:31 AM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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302 are close chamber 318 heads.
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: 360 HEADS SWITCH!
[Re: erick72]
#145405
11/04/08 08:24 AM
11/04/08 08:24 AM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
ok so as in kick in the ants you mean stompin on the gas from a dead stop and gettin a little squeel?lol
or it will be bad?
so what does milling usually cost and if i don't do it i just won't gain any horse.right?or do i need to to really get a difference.
this is the main thing though
i literally just wanna buy a cheap dirty set to cleanup re do the valve seats and bolt on with no probs and add some horse.
so if i get 360 heads with the 302 casting date that should add some horse?
sorry i just wanna get this right.thanks
p.s what did the 302 casting heads come on?
What it mean is yes you will have a gain with it that you will feel. Not as much as with the the heads milled to give you some more compression but none the less you will have a gain.
Don't just buy a used set of heads with out having them checked for cracks or some sort of guarentee that they are rebuildable.
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Re: 360 HEADS SWITCH!
[Re: MoparforLife]
#145406
11/04/08 11:52 AM
11/04/08 11:52 AM
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Joined: Jul 2005
Posts: 862
Doo-Dah, KS
440fied
super stock
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super stock
Joined: Jul 2005
Posts: 862
Doo-Dah, KS
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In my example I don't think it was the best possible combination, but it was better than the 2-barrel intake and small port 318 heads that were on it.
The 340 resto cam is a pretty good cam, although there are some Comp cams we would have liked to have tried instead, but this motor was built with parts we had laying around.
The 308 casting 360 heads are an open chamber, and do have the small 318 exhaust ports, but they have the bigger 360 intake ports and the headers do help with exhaust flow.
If we had to try it all over again we might have used a set of 360 "J" heads with 2.02 valves, pocket port, gasket match to an Edelbrock air gap performer rpm intake and either comp cam XE268H or maybe XE274H, but at that point why not just build a 360, it's 42 cubic inches bigger to start with.
If you have a set of 360 heads with 1.88 valves and the heads are in good shape, I say go ahead and use them on your 318. Make sure you pick a cam, intake, and exhaust system that works well the heads though.
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Re: 360 HEADS SWITCH!
[Re: 440fied]
#145407
11/04/08 12:57 PM
11/04/08 12:57 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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If you're gonna bolt and run tham anyway, why not go Magnums? They'll do better than the 302s, are more plentiful, and I would think will be cheaper. Patrick on here has a few sources for mild factory and Engine quest done sets cheap. You'll have to replace the lifters and pushrods too.. but that's not a big deal.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: 360 HEADS SWITCH!
[Re: moper]
#145408
11/04/08 01:29 PM
11/04/08 01:29 PM
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Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
master
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master
Joined: Apr 2007
Posts: 2,826
NY usa
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Quote:
If you're gonna bolt and run tham anyway, why not go Magnums? They'll do better than the 302s, are more plentiful, and I would think will be cheaper. Patrick on here has a few sources for mild factory and Engine quest done sets cheap. You'll have to replace the lifters and pushrods too.. but that's not a big deal.
Magnum heads would be the best choice.
They flow more then any other head in storck form.
The close chamber will increase compression.
The cost of the mag. head would be the same or close to any toher small block head. but when you factor in a different intake the correct lifters and pushrods for the oiling of th magnum heads you will be spending more.
If you have the money or time to save up some coin the magnum heads are a the best choice IMO.
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Re: 360 HEADS SWITCH!
[Re: 440fied]
#145409
11/04/08 05:15 PM
11/04/08 05:15 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
If we had to try it all over again we might have used a set of 360 "J" heads with 2.02 valves
The 2.02 valves would be a waste. Even on a 340 or 360 they do not come into play until the higher RPM band is reached. In fact they can rob low end torque over the 1.88 valve head on a 340/360. On a 318 the effect would be worse yet.  Some well versed machine shops told me this and I didn't believe it either till I took a set of 2.02 heads and made sure that the heads were cc'd the same and as close to equal specs as would very likely to be OEM. No other porting or machine work done. I gained absolutely nothing. Just as I was told would happen. Although they said that I could have gone the other way to but in my case I didn't.  Use volocity rather than volume.
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Re: 360 HEADS SWITCH!
[Re: erick72]
#145410
11/04/08 05:21 PM
11/04/08 05:21 PM
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Joined: Jan 2003
Posts: 2,111
Bowie, MD
Reggie
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,111
Bowie, MD
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Quote:
p.s what did the 302 casting heads come on?
302s were used on 2BBL civilian versions of 1985 and up Diplomats, Gran Furys and Fifth Avenues, but NOT on the 4BBL cop cars. They are closed chamber heads as mentiond and should give you a nice compression boost. I would go with Magnums if I had to choose though.
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Re: 360 HEADS SWITCH!
[Re: Moparnut426]
#145416
11/19/08 08:21 PM
11/19/08 08:21 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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302's = better. magnums = much better. that way when you're done you'll for sure feel the difference and yes consider going with a 360. I believe any of the open chamber 360 70's heads(including 915's) will leave you dissapointed.
live every 24 hour block of time like it's your last day on earth
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Re: 360 HEADS SWITCH!
[Re: RapidRobert]
#145417
11/19/08 08:27 PM
11/19/08 08:27 PM
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Joined: May 2003
Posts: 571
central PA
mopartial
mopar
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mopar
Joined: May 2003
Posts: 571
central PA
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I'd love to, but dont Magnums take a different intake or need drilled to accept std LA intake?
If it aint broke, dont break it.
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