What do you think about my 360

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1973dusterkid

1973dusterkid

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Ok so I bought a 360 to replace the 318.
Backstory the guy said it was in a dirt track car ran 3 races crashes the car and never drove it again.It was complete mins carb and distrubter.

What I know it has 340 J heads big valves
It is a 70 casting 360.It also had flat tops,
Std bore.318 timing cover,It had a center sump
oil pan so I dont need a new pan.

What I dont know I dont know what kinda intake it has it a iron high rise 4bbr said to be a 340 intake.The guy said it had a purple stick but did not rember what size.(think .484)

I was going to build the 318 but found this for 1 dollar a cube.I cn use most of the parts that I bought for the 318.I also have the 318 to rob some parts off of.

The heads are in the parts washer.For now I am just going to rebuild it like it is then late pull it and build it.

This might be hard but do you guys think you could give me a idea of what my compression is,It had 340 head and flat tops.


IMG_1974.jpg

IMG_1973.jpg

IMG_1972.jpg

IMG_1971.jpg

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The 318 for parts
IMG_1978.jpg
 
1971 was the very first year for the 360. So, a date coded 70 engine is a 71 model year engine. Also, in your favor is that 1971 was the only year the 360 had "high" compression. The books all show the same compression as the later 360s, but it ain't true. The 71 360 pistons had a higher compression height and the static compression was around a a true 8.5 for the 71 motor. So, 9:1 is very possible with minimal work. Also too the 71-73 blocks were usually thicker castings. I'd say for a buck a cube, you got a good deal. Of course, regardless of which cam it is, you'll need new lifters since they were all just chunked in the valve covers. What moron did that? If they had arranged the lifters in the order they came out, you could reuse them. As it is now, you have to replace them with new lifters.
 
Oh and how bout resizin your pics so the thread ain't stretched all to hell?
 
Much better foundation you have now imo. I would check piston to valve clearence as a few of those pistons look to have been kissed by a valve. Probably just a little float on a over rev, but wont hurt to check with a unknown cam.
 
Iron intake looks like a stock 340 intake from back then. They were pretty tall. The blue paint under the orange is the right color for a '69 340.
Back then I painted my stock 340 intake with "aluminum" paint and fooled more than a few people. Talk about the stupid things you do when you're young, broke, and doing a "budget" upgrade.
 
Measure how far the piston are below deck and cc the heads than you won't have to guess on compression, is it standard bore? Since you got to buy new lifters anyways I'd buy new cam as well that way you get one that works for your application.
 
I ran the Crane hydraulic powermax 467/494 222/234 @.050 cam in my 71 360 years ago, so I KNOW that fits with no worries. It ran like hell too for a near stock motor.
 
Take a look INSIDE the intake carb mount, look for "floor jets" inside. The early EGR had no external EGR valve, just really "leaks" drilled from the intake floor into the heat crossover.

If you have e'm, you'll want to plug 'em and grind the floor smooth around 'em

29w4wtz.jpg
 
I think early 360 4 bbl motors had a shot penned crank like the cast 340 cranks.

Ditto on measure piston height and chamber cc to get the static comp confirmed.

Are the lifter bores bushed? I keep seeing a hint of bronze color.
 
The only thing I can tell for sure is : it has a double roller chain,
purple paint on the cam, high rise manifold.

How about somemore pics.
Sides of the block, heads,ports,valves.
 
It depends on what you're doing as to whether 2.02s are "better". 340s came with J heads. I had an original 73 Charger Rallye with it's original 79K mile motor. Also, 1973 was the first year for the EGR ports in the intake floor. 72 and prior had none.
 
Kid,you flat scored.The cam Stroker recommended rocks.Fairly easy to tune,and hammers HARD.
 
73AbodEE said:
please confirm or ? Stroker, i need to know to
Click to expand...

Some did and some didn't. Likely when they went from the X to the J they had 2.02 valves left and used them up. If you have 1.88 heads you can add 2.02 valves. Like Stroker said, there is a place for 2.02 valves. Depends on the build
 
74DartSwinger360 said:
What year J heads had the 2.02 intake ports? What did they come on?
Click to expand...
the intake ports are the same size on the j and x heads the only diff between the two are some j heads came with the smaller intake valve some came with the 2.02 like the x other than that they are the very same
 
74DartSwinger360 said:
What year J heads had the 2.02 intake ports? What did they come on?
Click to expand...
the intake ports are the same size on the j and x heads the only diff between the two are some j heads came with the smaller intake valve some came with the 2.02 like the x other than that they are the very same
 
People say some came from the factory with 2.02s. I have yet to see a set. That doesn't mean they didn't come that way I guess......BUT not ALL 340s had 2.02 valves. Beginning about half the 72 year model, the 340 got J heads with 1.88 and 1.60s and the lower compression pistons with a cast crank and continued like that until the end of the 73 model year, when the 340 was discontinued. I have had people show me "factory" 2.02 J heads several times through they years. Every time I inspected them thoroughly, I found evidence the intake seats and bowls had been enlarged. Every time. I know the X heads were 2.02s. I've never seen a 1.88 X head in my life. Has anybody else? This would be a good topic for discussion and maybe do some research on. I would tend to think that regardless of my experiences and what I might THINK, that what would actually be found fact might be different. Because as soon as you say never with Mopar, somethin rolls up and proves you wrong every time.
 
StrokerScamp said:
None had 2.02 valves. Who said that?
Click to expand...

Are you sure?
I picked a set of "J" heads off a 1971 360 on an old cop car sitting in the junkyard back about 1982 and it had .202 intake valves.
The motor had so much grease on it, I would bet it never was apart.
 
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