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Re: LA 915 heads on top a 318
[Re: mopowergtx]
#755640
07/24/10 10:51 AM
07/24/10 10:51 AM
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Joined: Apr 2010
Posts: 1,216
Under My Car
Mopar_Country
pro stock
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pro stock
Joined: Apr 2010
Posts: 1,216
Under My Car
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Quote:
Yeah it just seems to me to gain anything from the 4 bbl intake and Thermoquad a set of 360 heads have to go on there. The mismatch between the 318 intake ports on my stock heads versus the 360 intake would be a real bad scenario. Leaving the stock heads on there would be WAY easier for sure but would it negate any gains from the Thermoquad and intake?  When Chrysler put this combo together(360 heads 360 intake) on the 318 cop cars did they have different pistons in the 318's versus what I'm running?
I was just out checking out the stock 1979 spreadbore intake versus where my A/C brackets land. Looks like I'm good on the passenger side but I am missing what I need on the drivers side. My 2bbl intake has a squared up stat housing where the 360 intake is off towards the drivers side and canted. Its right where the drivers side gusset mount is running right now on my intake.
Twie!CWk~$(KGrHqIOKkQEwODCfvCLBMM5ipi06!~~_12.JPG)
Actually no. I don't think you will notice the mismatch. If you want you can gasket match the intake ports on the heads to the intake, just be sure not to remove too much so you get into the water jacket. I am running a 340 intake and I removed the heads and cleaned them thoroughly port matched the intake and reassembled with new seals and springs. If you go this route be sure and keep your valves in order, and pay attention to the rocker and rocker shaft placement. They DO go on a certain way. I suggest picture before dis-assembly. Pay close attention to the notch on the rocker shaft, they are placed a certain way for oiling. My combo pulls real good through 5500 rpm's.
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Re: LA 915 heads on top a 318
[Re: mopowergtx]
#755642
07/24/10 01:11 PM
07/24/10 01:11 PM
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Joined: Oct 2003
Posts: 7,863
Colorado
Leadfoot
master
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master
Joined: Oct 2003
Posts: 7,863
Colorado
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Quote:
And I dont want to hear how I should put a set of Magnum heads on there thats not going to happen. LA heads only on a LA motor here.
Fine. Be that way.
For just a little more than the costs of purchase, reconditioning, and machine work you can get a set of these.
http://tinyurl.com/26vesje
LA Heads with a 62cc chamber that outflow the Eddies.
My math says a full point and a little more is what you'll gain over a 72cc chamber.
You can also get them with a 2.02 valve if you wish.
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Re: LA 915 heads on top a 318
[Re: Reggie]
#755649
07/24/10 08:39 PM
07/24/10 08:39 PM
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Joined: Jun 2006
Posts: 3,075
Eastern Ohio
mopowergtx
OP
master
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OP
master
Joined: Jun 2006
Posts: 3,075
Eastern Ohio
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Quote:
Quote:
Looks like this Eddie intake has the mounting boss right in the drivers side front between the first two intake mount bolts for what I need for my A/C gusset bracket. Chrysler must have used different brackets between the 318 2bbl and 360 4bbl A/C setups. Dang. 
It has nothing to do with the engine size. The 1978-earlier intakes have the thermostat housing in the center for the older V-style A/C compressor. Chrysler changed all intakes in 1979 to the offset thermostat housing style to accomodate the newer style A/C setup. The older V-style A/C can interfere with the 1979 and later offset thermostat housing location. The pic below shows the difference in the thermostat housing location for an early 340 intake on top and a 1979 and later intake at the bottom. You could switch over to a later compressor and brackets from a Fifth Avenue junker, but I'm not sure about controls and fittings... 
Heck, while you're at it on the Fifth Avenue, you can grab the 302s from it too. Civilian M-body cars with closed chamber 302s were 9:1 compression which was over one half point compression more than the 8.4:1 cop cars with open chamber 360 heads. 
Oh. Dang it anyhow. Thanks for the info. Okay I was scrounging through my treasures today and I found another cast iron spreadbore intake. Completely different choke set up though. Its dated Nov 1971 so that would make it a 1972 version. Now I was able to order a new choke for the 79 style but couldnt find anything at Autozone on their computer for this 72 though.
Was it a one year only deal? The choke I ordered for the 79 is showing it working all the way back to 73.
I also have a Mopar dual plane intake which has the squared up T-stat and the bosses for my A/C. It kinda looks like a spreadbore would go on it. Ever so slightly bigger in the back as the front. Not the extreme of the stocker though. Couldnt find where my T-Quad was though to throw it on there and try it. Nice looking intake but the choke mount is WAY different than the 79 intake. The MOPAR intake looks similiar to the 72 intake but the choke mount is flush with the carb base.
The Eddie 2176 looks like it has the A/C bosses and the choke well I need but the T-stat is offset. I see its dual pattern though, I'd guess it would clear my V-Twin A/C compressor. But dang I dont have one of those.
I also did relize I have a set of fresh Magnum heads on a 360. It has aftermarket 1.6 aluminum roller rockers on it right now. Seems like they would be the way to go from your guys suggestion but it looks like my A/C has a bracket hooked to the pass. side head right now on my 318. Surely these heads arent going to have what I need for mounting bosses. I found I have one set of greasy rusty 915's and one set of 915's that have a stock rebuild never fired sitting on a 360 on a stand.
I was fired up about the RHS LA"X" heads but they dont have the heat crossover for the choke well. And I wont sacrafice that. Right now this car fires right up cold and you can throw it Drive and go. It has never stalled or coughed coming off a cold start in the 7,000 miles I have drove it. I wont let go of that function. I got to maintain a 100% functioning stock choke setup with the Thermoquad. Thats actually is more important to me than the bump in power. I'm not shooting for a bunch of HP. If it can run low low 16's in the 1/4 with 2.94 gears I'll be more than happy. Break into the 15's and thats a super bonus I dont expect to see though.
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Re: LA 915 heads on top a 318
[Re: derekeh]
#755650
07/24/10 08:45 PM
07/24/10 08:45 PM
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Joined: Jan 2003
Posts: 5,894
Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,894
Florida
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Quote:
Im going to fill my combustion chambers with JB weld to lower the cc on my 360 heads. Then they will work perfect on my 318.
I really hope you are kidding. 
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Re: LA 915 heads on top a 318
[Re: mopowergtx]
#755653
07/24/10 09:24 PM
07/24/10 09:24 PM
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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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I would pop those 920 casting heads on it and not think twice about the hardened seats (or lack there of). I have seen lots of mopar people running non-hardened seat heads without any problem. I ran a 6 dart for years with those 67 heads and when it finnaly spun a bearing the heads still looked great. They out flow the 302 head and they have slightly smaller chambers. You will not regret putting them on there. Also I would not worry about the port mismatch, been there done that and it was no issue at all.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: LA 915 heads on top a 318
[Re: HotRodDave]
#755656
07/24/10 09:50 PM
07/24/10 09:50 PM
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Joined: Jun 2006
Posts: 3,075
Eastern Ohio
mopowergtx
OP
master
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OP
master
Joined: Jun 2006
Posts: 3,075
Eastern Ohio
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Quote:
I would pop those 920 casting heads on it and not think twice about the hardened seats (or lack there of). I have seen lots of mopar people running non-hardened seat heads without any problem. I ran a 6 dart for years with those 67 heads and when it finnaly spun a bearing the heads still looked great. They out flow the 302 head and they have slightly smaller chambers. You will not regret putting them on there. Also I would not worry about the port mismatch, been there done that and it was no issue at all.
Yeah Dave I rolled those 920's around today and they sure have a sweet looking combustion chamber. Shame they didnt retain it into a 2.02/1.60 head. No doubt with them I sure wouldn't lose any squeeze and you would think I'd pick up a better quench area. Heck might pick up some compression actually. I havent got a chance to look at a 70's 318 head yet to compare to. I should have some sitting around somewhere to get a peak at tomorrow.
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Re: LA 915 heads on top a 318
[Re: OrangeProwler]
#755657
07/24/10 09:53 PM
07/24/10 09:53 PM
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Joined: Jun 2006
Posts: 3,075
Eastern Ohio
mopowergtx
OP
master
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OP
master
Joined: Jun 2006
Posts: 3,075
Eastern Ohio
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Quote:
Just curious but, I am wonder what heads should be on 68 318 engine? I see the 920s mentioned in the above post. Is the 67s closed chamber? TIA
The 920's are definately closed chambered. I'll try to get a pic tomorrow afternoon of them. They were a 66-67 LA head.
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Re: LA 915 heads on top a 318
[Re: Dakota_Don]
#755658
07/24/10 09:58 PM
07/24/10 09:58 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:
I have never tried the 360 heads but have always wanted to.
But i have heard more bad then good, so i never did it..
"Heard" is the key word.
They work surprisingly well - throw the dam text book away in this case. I said it before but the factory police packages were rather hot and that is all they were. Have personally switched some over and it will surprise you what they will do. It will wake up a sleepy 318.
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Re: LA 915 heads on top a 318
[Re: OrangeProwler]
#755659
07/24/10 10:07 PM
07/24/10 10:07 PM
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Joined: Jun 2006
Posts: 3,075
Eastern Ohio
mopowergtx
OP
master
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OP
master
Joined: Jun 2006
Posts: 3,075
Eastern Ohio
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Quote:
Just curious but, I am wonder what heads should be on 68 318 engine? I see the 920s mentioned in the above post. Is the 67s closed chamber? TIA
LA Engine Cylinder Heads Casting Numbers
Casting Number Engine CID Year Intake Exhaust
2465315 273 1964-65 1.78 1.50
2532080 273 1964-65 1.78 1.50
2536178 273 1966 1.78 1.50
2658234 273 1966 1.78 1.50
2658920 273/318 1966-67 1.78 1.50
2843675 273/318 1968-74 1.78 1.50
2268341 318 1962-67 1.84 1.56
2658234 318 1967 1.78 1.50
2843675 318 1968-74 1.78 1.50
3769973 318 1975-83 1.78 1.50
4027163 318 1977-86 1.78 1.50
4027593 318 1977-84 1.78 1.50
4323302 318 Fast Burn 1985-86 1.78 1.50
4323345 318 Police 1983-86 1.78 1.50
2531894 340 1968-70 2.02 1.60
3418915 340TA 1970 2.02 1.60
3418915 340 1971-72 1.88 1.60
3671587 340 1973 1.88 1.60
3418915 360 1970-72 1.88 1.60
3671587 360 1973-74 1.88 1.60
3769974 360 1975-76 1.88 1.60
3671587 360 1976 1.88 1.60
4027569 360 1977-86 1.88 1.60
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How long have I had that? 
