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Only due to the cyl walls not being thick enough

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Only due to the cyl walls not being thick enough

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So the 340 block has a little more "meat" built into it? Are they the same size, physically, on the outside?

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They are the same size on the outside.. but the 340
starts out with a larger bore due to the sand casting
and a smaller water area between the cyls.. the inside
is cast different in the bore areas.. yes they can
be bored and sleeved but a 273 isnt worth it

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MuuMuu there are a ton of small block combos you could build, but bang for the buck it is hard to beat a warmed over 360 for a street car.

If the budget is a little bigger a 408 with some cylinder head is a fun way to go.

But it is a slippery slope when it comes to how much is enough when it comes to go fast stuff.

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Engine Build Warning:
Use Extreme Caution or just throw the "budget" out the window!
DAMHIK

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MuuMuu there are a ton of small block combos you could build, but bang for the buck it is hard to beat a warmed over 360 for a street car.

If the budget is a little bigger a 408 with some cylinder head is a fun way to go.

But it is a slippery slope when it comes to how much is enough when it comes to go fast stuff.

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Engine Build Warning:
Use Extreme Caution or just throw the "budget" out the window!
DAMHIK

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Truer words have never been spoken.

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MuuMuu there are a ton of small block combos you could build, but bang for the buck it is hard to beat a warmed over 360 for a street car.

If the budget is a little bigger a 408 with some cylinder head is a fun way to go.

But it is a slippery slope when it comes to how much is enough when it comes to go fast stuff.

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Engine Build Warning:
Use Extreme Caution or just throw the "budget" out the window!
DAMHIK

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Truer words have never been spoken.

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x2 100%. All LA motors have the same bore centers, the difference being the thickness
of the wall castings. Which is why Mopar separated them into two sub-family groups: 273/318 and the 340/360. The walls of the 273 may not be able to be bored even to the 318 size (3.91"), without sonic testing (273 is 3.63" bore). Depending on the year and whether the block can take an overbore, chances are next to nil to increase the bore to the 340 piston size. Sorry. On the bright side , the 273, CAN take increased stroke length, adding MORE TORQUE to the motor .

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MuuMuu there are a ton of small block combos you could build, but bang for the buck it is hard to beat a warmed over 360 for a street car.

If the budget is a little bigger a 408 with some cylinder head is a fun way to go.

But it is a slippery slope when it comes to how much is enough when it comes to go fast stuff.

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The 408 is a natural for street/strip action and if that is not enough motor for you, there are increased displacements all the way to the "popular" 426 cube mark. A 340 or 360 block can be used.

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MuuMuu there are a ton of small block combos you could build, but bang for the buck it is hard to beat a warmed over 360 for a street car.

If the budget is a little bigger a 408 with some cylinder head is a fun way to go.

But it is a slippery slope when it comes to how much is enough when it comes to go fast stuff.

---

Engine Build Warning:
Use Extreme Caution or just throw the "budget" out the window!
DAMHIK

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Truer words have never been spoken.

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What is this thing you call a "budget?"

I knew there was something different about the 273/318 blocks vs. the 340/360 blocks. I was just curious what that difference was.

I've talked to a couple members here and FABO and it definitely seems like quite a bit of work to get a 273 to go quick on pump gas. Even if built to D-Dart specs or a little better that only puts you at about 300 hp which is more easily achievable with any other small block.

A guy on FABO is building a mild 408 or 410 with turbos and is expecting to make 700 hp on 91 octane... Is that fast enough?

http://www.forabodiesonly.com/mopar/showthread.php?t=116512

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I have 2 of these 273ci engines both are 1967.one being the 235hp version the other 180hp.What are they good for other than a boat anchor.

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I've got a stock forged(all the 273s had forged cranks)
but if you want to use a auto behind it CHECK the center
counter bore for the auto.. mine is a stick crank
and the conv wont fit as is

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I've pulled apart a couple 69s that looked original after buying them for the cranks and found them to be cast

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I've got a stock forged(all the 273s had forged cranks)
but if you want to use a auto behind it CHECK the center
counter bore for the auto.. mine is a stick crank
and the conv wont fit as is

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I've pulled apart a couple 69s that looked original after buying them for the cranks and found them to be cast

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Someone put 318 cranks in there
EDIT
if they were real late builds Chrysler could have
put them in if they were out of cranks.. they did
weird stuff all the time