How to I.D. the different /6's.

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Is there a mark somewhere that says 225 on it? I want to know now!
 
And here's a nice clean table:

Chrysler Slant Six Block Casting Numbers
Filed under Mopar Six Cylinder Casting Numbers

The slant six engine was introduced in 1960 in two versions – 101 hp, 170 cu. in. and a 145 hp, 225 cu. in. From this modest beginning, the slant six built its reputation for performance and reliability. At the end of the ’69 production year the 170 slant six was dropped and a new 198 cu. in. version was introduced to replace it. At the end of 1974 this version too was dropped and only the 225 survives.



http://www.hotrodreference.com/8/chrysler-slant-six-block-casting-numbers/
 

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Isn't the displacement stamped on the lip of the block behind the coil?
 
IIRC for ease of ID, the 170 used a shorter by-pass hose (approx 2 inch), the 198 and 225 cu/in with longer stroke, had a longer by-pass hose (approx 3 inch).

cheers.
 
64DartGTinAZ said:
The slant six engine was introduced in 1960 in two versions – 101 hp, 170 cu. in. and a 145 hp, 225 cu. in. From this modest beginning, the slant six built its reputation for performance and reliability. At the end of the ’69 production year the 170 slant six was dropped and a new 198 cu. in. version was introduced to replace it. At the end of 1974 this version too was dropped and only the 225 survives.
Click to expand...

The pertinent fact about this is:

In the USA, EVERY SLANT SIX EVER BUILT, REGARDLESS OF DISPLACEMENT, had the same cylinder head. That means that the engines built with the 33% increase in displacement that occurred with the 170 becoming a 225, were equipped with the very same tiny ports and valves that were big enough for a 170, but, created a 225 that just could NOT breathe well... It was like running a marathon with your mouth taped shut. Think about that...

Many years went by, with slant sixes having money thrown at them to try to get a decent-breathing head on top, but it never happened. They got a well-deserved reputation as being pretty much a lost cause, naturally-aspirated, when they failed to respond to the usual hop-up procedures, and, eventually, people gave up... it was obvious that nothing helped; the head would always defeat whatever was done...

THEN, forced induction was tried with amazing results; the weak-kneed slants took to it like a duck takes to water... and in addition to making a LOT of power (500+ horsepower,) the engine proved to be especially-well suited for the high-boost levels that provided all this power... It proved to be a really TOUGH engine, because of its aluminum "roots." It came (for years,) with a forged steel crank that had main bearings that were the same size as the ones in a 426 Hemi.

So, when you look at a slant six, consider the potential... It is an engine that is capable of delivering 10-second quarter-mile rides for early A Bodies at nearly 130 mph....

All through the magic of turbocharging (or supercharging.)

Here's one example: [ame="https://www.youtube.com/watch?v=7QzUfV8iTpQ"]Turbo Slant Six 10.74 @ 127 mph 7-19-10 - YouTube[/ame]
 
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