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Ring sizes
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Topic: Ring sizes (Read 1856 times)
Pahs59
nsw-club
Junior Member
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Model: FE
Posts: 87
Throw nothing away leave that for your children
Ring sizes
«
on:
August 09, 2021, 09:50:19 AM »
0
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
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ardiesse
nsw-club
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Model: FC
Posts: 1296
Re: Ring sizes
«
Reply #1 on:
August 09, 2021, 10:29:53 AM »
0
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
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Remember: if your Holden's not leaking oil, it doesn't have any.
ardiesse
nsw-club
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Re: Ring sizes
«
Reply #2 on:
August 09, 2021, 07:54:00 PM »
0
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
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Remember: if your Holden's not leaking oil, it doesn't have any.
grey nomad
Junior Member
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Posts: 83
Re: Ring sizes
«
Reply #3 on:
August 09, 2021, 08:04:00 PM »
+1
.040” oversize. AL.
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