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  #1  
Old 10-06-2007, 03:07 PM
Drdan524 Drdan524 is offline
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Default Head casting numbers?? Intake manifold

I have a 318 out of a 1985 Dodge Diplomat NY state trooper car. I was looking to see what heads are on it because I read that the Police package 360 heads don't drop compression ratio where as putting stock or civilian 360 heads lower compression ratio. Where on the heads can I find the casting number? The only thing I saw was an 81 but it was a molded part of the head, not stamped.

While I have you here, I found an old Edelbrock Performer intake manifold off a 1984 Dodge pickup. Is that manifold a decent manifold for a daily driver or would I be better off with something else. Since it's free, I figured I would keep it unless it's going to hurt me more than help. Also with this manifold, if you are looking at the manifold where the carb mounts there are 2 holes about 3/8 diameter down through the to the heat riser. Are these holes supposed to be there? Do they help or do anything?

Thanks,
Dan
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Old 10-06-2007, 03:37 PM
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rumblefish360 rumblefish360 is offline
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A 360 head is a 360 head is a 360 head.

Take the intake, it'll work well on the 318.

I think your looking at the well jets in the floor of the plenum. These recirculate exhaust gas for emissions. No need to worry.
You are looking down the plenum right. (The area under the carb?)
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  #3  
Old 10-06-2007, 05:19 PM
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Locomotion Locomotion is offline
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Some 318's around that time did have 360 heads. (Or perhaps a few years earlier, I don't recall.) Post the casting # and someone can look it up. The numbers will be raised in the casting, not stemped.
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Old 10-06-2007, 05:39 PM
TK TK is offline
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Quote:
A 360 head is a 360 head is a 360 head.
Is a 360 head, a 360 head, a 360 head.

The compression ended up being about 7.5-1, if I remember, on a cop 318. I think they did it for two reasons, one, so it would have a higher top speed, because of the big ports, and two, you could run it flat to the floor, hard, and have less chance of it getting hot and detonating.
Just like the old trucks, the standard 318 had 8.5, the -3 318 had 8.0.
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Old 10-07-2007, 03:23 PM
it's all dodge it's all dodge is offline
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whats the number on that intake 2176 or 3776?
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Old 10-07-2007, 04:35 PM
Drdan524 Drdan524 is offline
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I will have to post the numbers Tuesday. The car is at my parents in the garage. Where is the number supposed to be on the heads and on the Edelbrock intake? I didn't even look at the intake manifold that well, I just put in the pile of parts that are going back on the car. Thanks for all the information given so far!!!!
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Old 10-07-2007, 07:54 PM
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cageman cageman is offline
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I just pulled a motor out of an 8o something cop car, it was a 318 and it has 360 heads on it, I checked the block and it was a 318 for sure, but the heads were cast 360, and I forgot the number, 345 maybe, I was hoping for swirl ports, but it must be older than that. I was surprised to see the 360 heads on it, I spose becuase of the port mismatch, they put the 360 heads to match the 360 intake.
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Old 10-07-2007, 07:55 PM
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Thats weird, it posted the same post twice, so I just deleted it, and wrote this instead.
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Old 10-08-2007, 01:26 AM
it's all dodge it's all dodge is offline
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my book only goes thru head numbers thru 83, but liststhe 596 and 051 as 360 heads, and 2176 be a non egr intake, 3776 is egr, hope this helps
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Old 10-09-2007, 01:53 PM
Drdan524 Drdan524 is offline
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OK, I have all the numbers off the heads. All the numbers are on the intake runners. Cylinder #1 has 4323345 which is the part number, Cylinder #3 is N198, Cylinder #5 is HN and Cylinder #7 is 360. Any idea what the numbers mean if anything?

Also, the part number on the intake is 3776, which is the EGR version of the Edelbrock 2176.

Thanks,
Dan
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Old 10-09-2007, 11:35 PM
dodger1 dodger1 is offline
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4323345 is the 318 cop head for 83-86, according to "How to rebuild your s.b. mopar" 75cc open chamber, 1.88" intake, 1.60" exh., Garden variety 360 heads used these valves but had a smaller open chamber around 66 cc.. No info on whether the 345 ports are 360 sized, but I assume they are as the engine came with the factory iron spreadbore intake. The closed-chamber 4323302 head has a 62.6 cc chamber, but smaller 1.78/1.50 valves. Your Eddy is basically the same as the factory iron intake (which works quite well) but a lot lighter!!
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Old 10-11-2007, 11:37 PM
Drdan524 Drdan524 is offline
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I found that link that read these heads were used from 1985 to 1991 and are supposed to be 74cc with a swirl port heads but are "indistinguishable" from earlier heads. It also says that the 345 heads use 1.88" intake valve.

Now on Mymopar.com I found where ot states the heads only use a 1.78" intake valve and were used from 1983 to 1986 Police use.

I will have to just take measurements of valves and take a good picture of the ports. I am really just trying to plan what,if anything, needs to be done to the engine to make it a daily driver while still having enough power to run at the track.

Thanks,
Dan

P.S. if you P.M. me, I can send you a copy of the links I found since I don't have enough posts to add them here.
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