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#21
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What do I need to change my 2 barrel to a 4 barrel
In article > ,
> wrote: > "aarcuda69062" > wrote in message > ... > > > And no, the 340 wasn't a punched out 318 any more than a Chebby > > 350 is/was a punched out 265. > > Would look like basically a bore job. Stroke was 3.31, bore was 3.91 on > the 318 and 4.04 on the 340. ..130 inches different. Boring out would require a .065 inch cut, that equals roughly 1/3 the thickness of the cylinder wall. It'll run, but it'll probably sag in short order. > 318 (5.2) 1967-2002 3.31 3.91 > 340 1968-73 3.31 4.04 > > > > > > What are the other differences, Aarcuda? The blocks were different although the early 360s shared the same block casting number as the 340. Cylinder centers are the same, deck heights are the same, rods are different weight and casting number from what I've observed, cylinder heads are different in both valve size and combustion chamber volume, camshafts were different, timing chain and sprockets were different, main and rod bearings were different, different water pump, larger diameter by-pass hose, different ring groove depth in the pistons, different valve springs, different oil filter mount... |
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#22
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What do I need to change my 2 barrel to a 4 barrel
"aarcuda69062" > wrote in message ... > > What are the other differences, Aarcuda? > > The blocks were different although the early 360s shared the same > block casting number as the 340. Cylinder centers are the same, > deck heights are the same, rods are different weight and casting > number from what I've observed, cylinder heads are different in > both valve size and combustion chamber volume, camshafts were > different, timing chain and sprockets were different, main and > rod bearings were different, different water pump, larger > diameter by-pass hose, different ring groove depth in the > pistons, different valve springs, different oil filter mount... Considerable differences, for something that 'looks like a duck'. Thanks |
#23
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What do I need to change my 2 barrel to a 4 barrel
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#24
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What do I need to change my 2 barrel to a 4 barrel
aarcuda69062 wrote:
> > And no, the 340 wasn't a punched out 318 any more than a Chebby > 350 is/was a punched out 265. In other words, it is a punched out 318 (273, actually) in CONCEPT, but not in practice. Same block archetecture- deck height, crank geometry, bore spacing, bolt patterns, etc. But in practice the cylinder castincg cores were changed so the block casting is internally different. If you could REALLY "punch out" (ie bore) a 318 to 340 size, the 318 would have inch-thick (a slight exaggeration) cylinder walls. The 360 goes a little further in that the main bearing webs are different to accept larger diameter main bearings. |
#25
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What do I need to change my 2 barrel to a 4 barrel
> The blocks were different although the early 360s shared the same > block casting number as the 340. Cylinder centers are the same, > deck heights are the same, rods are different weight and casting > number from what I've observed, cylinder heads are different in > both valve size and combustion chamber volume, camshafts were > different, Yep, yep, yep.... timing chain and sprockets were different, main and > rod bearings were different, different water pump, larger > diameter by-pass hose, different ring groove depth in the > pistons, different valve springs, different oil filter mount... Now all THAT stuff is year-dependent as well. By the time the 340 was being replaced by the 360, for example, all 3 engines were using the same timing case/water pump castings and the bypass hoses were the same, but in earlier years they differed. Sorta the same for rods- the 318 started out using the lighter 273 rods and floating pins, but in late 73/early 74 or about, it went to the 360 rod with a pressed pin. It gets real interesting when a single engine architecture stays in production for >40 years. :-) |
#26
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What do I need to change my 2 barrel to a 4 barrel
What if it is a boat that I'm trying to convert
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#27
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What do I need to change my 2 barrel to a 4 barrel
I have a boat with a 2bbl holly carb want to convert to a 4bbl carb
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#28
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What do I need to change my 2 barrel to a 4 barrel
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#29
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What do I need to change my 2 barrel to a 4 barrel
On 12/20/2019 7:49 PM, wrote:
> What if it is a boat that I'm trying to convert > The matching intake manifold? Is this a trick question? http://www.2040-parts.com/_content/i...7/6797/001.jpg -- Andrew Muzi <www.yellowjersey.org/> Open every day since 1 April, 1971 |
#30
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What do I need to change my 2 barrel to a 4 barrel
On 21/12/19 12:49 pm, wrote:
> What if it is a boat that I'm trying to convert > First you need to understand the problem. I suggest you get hold of these books; Practical Engine Airflow - John Baechtel Performance Automotive Math - John Baechtel Then, when you understand how the engine breathes and, more importantly, makes torque, you will be in a better position to use this website; https://www.holley.com/retailer/carbselector/ Of course, you need to consider the type of use. A boat is a little different from a car since you use the prop loading to control engine RPM, gearbox not required - except for reversing and idling. -- Xeno Nothing astonishes Noddy so much as common sense and plain dealing. (with apologies to Ralph Waldo Emerson) |
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