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Title: Ring sizes Post by: Pahs59 on August 09, 2021, 09:50:19 AM I have a set of 3. 1/16 STD rings
What size pistons are these for They came with the car and was told there for the motor that was in it and it’s a B motor Putting the ring into the cylinder to check the gap and the gap looks way to big at least 5mm Pistons have 7406474 stamped on top Thanks Title: Re: Ring sizes Post by: ardiesse on August 09, 2021, 10:29:53 AM Three-and-a-sixteenth-inch is standard bore size for all B and J motors.
If, when you put one of these rings into the bore, and the ring gap's at least 5 mm, that means that the block's been rebored. (5mm/pi = 1.6 mm = 1/16") I'm guessing that the block's been rebored to 3-1/8". Or, the rings are for a 3" bore (132) motor. Do you have a digital caliper? Measure the bore diameter. That'll tell you. Rob Title: Re: Ring sizes Post by: ardiesse on August 09, 2021, 07:54:00 PM 7406476 is the part number for standard-bore 3-1/16" pistons. Normally the part number goes up with oversize.
7406474 has got me beat. Rob Title: Re: Ring sizes Post by: grey nomad on August 09, 2021, 08:04:00 PM .040” oversize. AL.
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