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#1
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318/360 Heads
I am getting back into Mopar V8's so I'm a little rusty. I was asking about 360 heads being a bolt on HP gain on a 318 block. The issue of piston interferance came up. I have the bump stick from the 318 (has a white stripe on it), or the one from the 360 (orange stripe). Is there a pushrod length I need to have or a lifter length?
I undertsand the clay in the cylinder test. But if there's anything I can do by installing the correct parts first, then testing it would save time. Thanks. |
#2
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I think you will not have an interference problem. The lifters, pushrods etc. should be the same. 360 cam is "bigger" than a 318 cam, but you should do the measuring with the cam you intend to use degreed in correctly. If performance is your goal, forget teh stock cams & lifters.
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#3
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360 head on a 318 are not a problem in anyway shape or form. The head can even have 2.02 valves installed and use a .484 lift cam. I know, i did this myself. If you do a cam swap of any kind, use the clay to KNOW exactly where you stand. It can only help.
The draw back of 360 heads on a 318 are; 1 larger combustion chamber. This lowers the allready low comp. ratio into the basement. 2 the size of the ports in the head slow down the air and fuel mix. This causes poorer drivabilty problems at low RPM's. 3* Use of a performaer intake will cause a port miss match. And a bad one at that. Inatke port window is to small against the head. This will cause air and fuel to crash into the head. More of the wrong turbulance in the wrong spot. Is it bad to install these heads after what you read. NO, just use them in a higher performance area than just upgrade or mild street and use with another intake besides the performers small port window. Gear higher to off set the weak lower end. Works like a charm. |
#4
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Quote:
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#5
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hello, use the 587 ,360 head with the 1.88 valves. change to the mopar sst intakes. they outflow the tulip valves. the 1.88 heads were designed for a 1.88 valve size. unless you open up the ports and do lots of grinding, the2.02 valve does not flow any better than the 1.88. the 1.88 will have a higher port velocity over the 2.02 in the same head. higher port speed will fill the cylinders faster and more air. this is from super flow!! port velocity and shape are the most critical. big valves and slower velocity are not it. just food for thought.
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#6
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Ok. You've given me some interesting opinions. So here's what I'm thinking.
318 short block bored .030 over, with new bearings and crank machining. New cam in the block (assume stock). Stock Hydraulic lifters, push rods, and rockers. 360 heads, 360 4 barrel intake, Edelbrock 750 performer carb. Workable? Thanks. |
#7
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sounded great right up til you mentioned that edle carb. Piece of junk that they have had problems with for some time. YOu would be much better off with teh stock 800 cfm Thermoquad. Much more throttle responsive than the edel or holleys. A good aluminum intake for your combo would be the Weaind action plus.
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#8
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Just my opinion, but for a stock cam 318 you will have too much port and intake runner volume and too much carb. To get any benefit out of the bigger heads you need to kick the output of the engine up a bunch, or all you will do is kill the bottom.
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#9
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This is basically the same combo me and a friend used on his 78 Dodge pickup and it ran suprisingly good for a 318 but his did have 3:55 gears which I'm sure helped alot. The carb was a thermoquad and I'm with DWC on the Edel being junk in comparison to the thermoquad. I've tested several different carbs. in the past and the definitive winner has always been a properly tuned thermquad.
BTW make sure and use the 1.88 valve heads for that small cam. You'd have to go pretty radical to make use of 2:02 valves. And another thing is if your gonna replace the cam with new why not step it up a notch. The price would be nearly the same and you can get some great mild performance cams that idle great and get better fuel mileage and have more power. |
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