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09-07-2013, 08:03 AM
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15-3/15-4 differences?
Can someone please tell me what changes were made from the 15-3 to the 15-4? Thanks! 
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09-07-2013, 08:10 AM
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According to SCSW-3, the dash 4 (1977) moved the gas ring from the yoke to the cylinder.
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09-07-2013, 10:51 AM
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Quote:
Originally Posted by skeezix
According to SCSW-3, the dash 4 (1977) moved the gas ring from the yoke to the cylinder.
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Is this generally regarded as an improvement?
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09-07-2013, 01:03 PM
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Yes. Especially with .357 Magnums (19/66), crud could build up between the cylinder and yoke and cause binding.
Before 1975 (end of '74), the gas ring was on the cylinder so only a couple of years of the 10 years the -3's were made had the gas ring on the yoke. Probably 80% of the 15-3's made had the gas ring on the cylinder.
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