Re: Various C123 engines

Posted by Stan(VA). on January 18, 2003 at 10:47:33 from (66.82.32.1):

In Reply to: Various C123 engines posted by Bus Driver on January 18, 2003 at 06:10:24:

Yes, I ran into this too. The 130/140/230/240 are all listed as C123 just like the Super C, but they are not created equal! This is over simplistic, but think of all those motors as being '113' or '123' flavors identified by the lower sleeve opening. The C113 had a 3 5/16" opening at he lower sleeve surface; and when they originally developed the increased power version as the C123, the lower sleeve surface opened up to 3 7/16" and they maintained the same sleeve thickness (going from 3" to 3 1/8" bore).

A/B/C/early Super A/late 130/230/140/240 series all had 'a version' of the '113', the late Super A's/Super C/100/200/early 130/early 230's had the C123. When the overbore piston/sleeve kits came out, you could turn a 113 into a 123 by going with thinner sleeves to get from 3" to 3 1/8", and from 3 1/8" to 3 1/4" on the C123's taking them to about 133 cubic inches.

What throws a wrench in the works is that all factory C123's are not equal. Specifically the early ones have the 3 7/16" lower sleeve openings and are capable of being turned into 'psudeo C133's', while the latter C123's (late x30 and the x40 series) are closer to being a C113 with a factory overbore kit already installed. If you pull a sleeve on your 140 you will probably find 3 1/8" pistons with thin sleeves and a 3 5/16" lower sleeve opening.

I haven't been able to verify this yet, but I suspect that the C135 (like a 340) is a C123 block with the factory overbore kit and a slightly stroked crank. The C153 (like a 504) seems to be the last iteration of the motor. They dumped the replaceable sleeves altogether and went out to a 3 3/8" bore.
Stan(VA).

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